Your 4-Week-Old Baby’s Milestones & Development - Baby and his first days

Baby and his first days

 



4-Week-Old Baby Development

According to Gina Posner, MD, a pediatrician at MemorialCare Orange Coast Medical Center in Fountain Valley, CA, at 4-weeks-old, your baby is really starting to become more communicative and responsive. “They start looking around more and responding to sound,” she says.

You may notice that your baby may turn their head to you when you walk in the room, especially if they can hear the sound of your voice.4 Your baby can still only see well a few inches in front of them, but you may notice that they are particularly enthusiastic when it’s your face they see from that distance.2 Babies this age are most excited by other humans, especially their family members.4

Unfortunately, this is also a time when your baby is extra fussy and may be exhibiting signs of colic, or inconsolable crying. Usually colic starts at around 3 weeks old, but it can start at 4 weeks, too. Colic tends to peak at 4-6 weeks, so it’s possible that you may be in the thick of it right now. Try to keep in mind that colic does pass eventually. It usually starts to get better at around 6 weeks and is resolved by 12 weeks.3 You should feel free to reach out to your pediatrician with any questions or concerns you may have about your baby’s crying.

Although 4 weeks is often a time of more awareness and interaction, many babies are still spending most of their time sleeping and not doing much else. Christina Johns, MD, pediatrician and senior medical advisor at PM Pediatrics, urges parents not to worry too much if they don’t feel that their baby is very perky at this age.

“At 4 weeks, lots of parents wonder when their baby will start to ‘wake up' a little and show some of their personality,” Dr. Johns says. “In the first month of life, newborns mostly sleep and eat and create messy diapers, so it can sometimes feel like there isn’t as much ‘bonding’ going on as a parent might like.”

Try to be patient, Dr. Johns advises. There will be lots of developmental changes happening in the next few weeks, and your baby is sure to show a little more personality soon.

All babies are different and will grow at their own pace. Still, four weeks marks a time when your baby should begin to grow pretty rapidly. Starting at about one month, your baby should be gaining about 1 ½ to 2 pounds per month. They should grow about one inch in length per month, and their head circumference should increase by about ½ inch per month.5

4-Week-Old Baby Milestones

As your baby grows, they are getting stronger and stronger. If you put your baby on their belly for tummy time, you may notice that they are better able to lift their head up. They may even be able to move their head from side to side at this age. You may also notice that your baby is able to hold their head up more steadily when you hold them, though you should still be supporting their head while holding them.2

When your baby was first born, their movements were likely very jerky and uncoordinated. You should start to see more deliberate movements from your baby at 4 weeks. As an example, you may notice that your baby more deliberately lifts their hands toward their mouth.2 Soon, they will discover how to purposefully put their hands in their mouth (get ready for lots of finger and fist sucking!).

At this age, many parents are worried if their baby hasn’t met certain milestones. It may be too soon to tell if your baby is behind—after all, they are only a few weeks old!—but the American Academy of Pediatrics (AAP) advises that you consult your baby’s pediatrician if you see any concerning signs of developmental delays.2

Some signs that should prompt a call to your pediatrician include if your baby is not suckling well and takes a long time to feed. Additionally, if you notice your baby doesn’t follow objects that are close by, doesn’t seem to blink when they see a bright light, or if they don’t seem to respond to sounds, you should get in touch with your doctor. Other concerns include if your baby continues to seem droopy, hasn’t gained strength since birth, or they don’t seem to move their arms and legs very often.2

Additional Behaviors

Some other milestones you may notice by the time your baby reaches 4 weeks include:

  • Begins to study your face2
  • May hold their hands in tight fists2
  • Gets excited when you speak or start signing2
  • Is beginning to extend their legs more often, rather than keeping them flexed6
  • Continues to have many of their newborn reflexes, including rooting, startling, and grasping6

4-Week-Old Baby Food

At four weeks old, your baby should be well over their birth weight and beginning to gain weight steadily, Dr. Johns says.6 As for feeding patterns, all babies are different, and you don’t really need to count feedings anymore or log every feeding as you might have in the early days. “Feeding is very variable at this age, and the most important metric is weight gain,” Dr. Johns recommends.

Dr. Posner suggests that parents continue to feed their babies responsively, and according to their baby’s cues. “I am a big fan of feeding on demand,” Dr. Posner says. “At this stage, most infants are good at knowing when they are full and when they are hungry.”

For breastfed babies, she recommends you feed your baby on demand. Most breastfed babies still feed about 8-12 times a day at this age.6 If you are formula feeding Dr. Posner recommends starting at 2 ounces and then increasing by an ounce at a time if your baby fusses or seems to want more.

Dr. Johns says that one of the top concerns she sees about baby feeding at 4 months old has to do with pooping patterns. When your baby was a newborn, they may have pooped very frequently, sometimes after every feeding. But it’s normal if things are starting to slow down by now.6

“Parents often ask about bowel patterns, and they can be very variable at this age, ranging from three times a day to three times a week, and all are normal,” Dr. Johns assures.

Another issue many parents grapple with at 4 weeks is spitting up. You can take heart knowing that spitting up is mostly just a laundry issue, and you can stock up on burp cloths now if you haven’t already!

“Spitting up is a big concern from most parents,” says Dr. Posner. “I explain that as long as the baby is gaining weight well and not in a lot of pain, this is normal.”

If your baby seems to be uncomfortable after feeding and/or is fussing, spitting up excessively, or arching their back as in pain after feeding, your baby may be experiencing infant reflux. If you suspect that your baby has reflux, you should speak to their pediatrician. They may suggest things like making sure to burp your baby after feeding, offering smaller, more frequent meals instead of larger ones, and holding your baby upright after feeding. In some cases, a medication that neutralizes stomach acid may be recommended by your doctor.7

4-Week-Old Baby Sleep

Sleeping is still one of your baby’s favorite pastimes at this age. You can expect a 4-week-old baby to sleep a little over 15 hours a day.1 This will be pretty evenly divided between night and day, though your baby may be moving toward doing a little more of that sleeping at night. Most babies this age sleep about 8-9 hours total at night, and about 7 hours total during the day.1

Your baby’s nighttime sleep is likely still broken up with frequent wake-ups, usually because of hunger.1 This is common, but it’s also normal to feel frustrated by this!

Dr. Posner says that the biggest question her patients have about sleep at this age is when their babies will sleep through the night. “They sleep a lot, but not in large stretches, so expecting them to sleep through the night at this age is a dream, not reality,” she says.

Some babies sleep longer stretches starting at 3 months, or when they have reached 12-13 pounds.1 But this varies tremendously, and some babies don’t start sleeping more soundly for several more months. Hang in there—your baby will get there soon enough.

Four weeks is still a time when you need to be extra cognizant of the danger of SIDS (Sudden Infant Death Syndrome). The AAP recommends that you keep your baby in your room at this age, but not in your bed. You should put your baby to sleep on their back on a firm mattress without any blankets, pillows, toys, or crib bumpers. At-home heart or breathing monitors are not recommended by the AAP.8

4-Week-Old Baby Schedule

At 4 weeks, while your baby doesn’t yet have a clearly defined schedule, you and your baby are probably starting to get into a bit of a routine. With your baby doing a little less sleeping during the day, and a little more sleeping at night, you might even be able to predict when your baby tends to need naps, and when they are more awake and alert.1

Now that your baby is becoming stronger and more aware of their surroundings, tummy time will become even more enjoyable. The AAP recommends that you do tummy time a few minutes at a time, several times a day.9 At this age, you can make it part of your daily routine.

You don’t need much equipment for tummy time, but as your baby gets older, they may enjoy a play gym that has mobiles or other bright patterns. Your baby may also enjoy a baby swing at this age during those more alert times of the day. Your baby may especially enjoy baby swings with bright lights and music.

4-Week-Old Baby Health and Safety

At 4 weeks old, your baby will have their first well baby visit since they were a few days old. This is an exciting moment for you and your little one.10

You are likely to have lots of questions about your baby’s growth and development. Your pediatrician will ask you questions about what your baby is doing at this age, and you can also come prepared to the visit with all your lingering questions. Don’t be afraid to voice any concerns you are having, big or small.

Vaccinations

At this visit, your baby will probably get their second Hepatitis B vaccination; however, some pediatricians give this vaccine at the two month visit.10 Your baby's next visit will be at 2 months.10 At the 4 week visit, you can take some time to ask your pediatrician what to expect at this next visit, and how to prepare.

Your 4-Week-Old Baby’s Milestones & Development

 



4-Week-Old Baby Development

According to Gina Posner, MD, a pediatrician at MemorialCare Orange Coast Medical Center in Fountain Valley, CA, at 4-weeks-old, your baby is really starting to become more communicative and responsive. “They start looking around more and responding to sound,” she says.

You may notice that your baby may turn their head to you when you walk in the room, especially if they can hear the sound of your voice.4 Your baby can still only see well a few inches in front of them, but you may notice that they are particularly enthusiastic when it’s your face they see from that distance.2 Babies this age are most excited by other humans, especially their family members.4

Unfortunately, this is also a time when your baby is extra fussy and may be exhibiting signs of colic, or inconsolable crying. Usually colic starts at around 3 weeks old, but it can start at 4 weeks, too. Colic tends to peak at 4-6 weeks, so it’s possible that you may be in the thick of it right now. Try to keep in mind that colic does pass eventually. It usually starts to get better at around 6 weeks and is resolved by 12 weeks.3 You should feel free to reach out to your pediatrician with any questions or concerns you may have about your baby’s crying.

Although 4 weeks is often a time of more awareness and interaction, many babies are still spending most of their time sleeping and not doing much else. Christina Johns, MD, pediatrician and senior medical advisor at PM Pediatrics, urges parents not to worry too much if they don’t feel that their baby is very perky at this age.

“At 4 weeks, lots of parents wonder when their baby will start to ‘wake up' a little and show some of their personality,” Dr. Johns says. “In the first month of life, newborns mostly sleep and eat and create messy diapers, so it can sometimes feel like there isn’t as much ‘bonding’ going on as a parent might like.”

Try to be patient, Dr. Johns advises. There will be lots of developmental changes happening in the next few weeks, and your baby is sure to show a little more personality soon.

All babies are different and will grow at their own pace. Still, four weeks marks a time when your baby should begin to grow pretty rapidly. Starting at about one month, your baby should be gaining about 1 ½ to 2 pounds per month. They should grow about one inch in length per month, and their head circumference should increase by about ½ inch per month.5

4-Week-Old Baby Milestones

As your baby grows, they are getting stronger and stronger. If you put your baby on their belly for tummy time, you may notice that they are better able to lift their head up. They may even be able to move their head from side to side at this age. You may also notice that your baby is able to hold their head up more steadily when you hold them, though you should still be supporting their head while holding them.2

When your baby was first born, their movements were likely very jerky and uncoordinated. You should start to see more deliberate movements from your baby at 4 weeks. As an example, you may notice that your baby more deliberately lifts their hands toward their mouth.2 Soon, they will discover how to purposefully put their hands in their mouth (get ready for lots of finger and fist sucking!).

At this age, many parents are worried if their baby hasn’t met certain milestones. It may be too soon to tell if your baby is behind—after all, they are only a few weeks old!—but the American Academy of Pediatrics (AAP) advises that you consult your baby’s pediatrician if you see any concerning signs of developmental delays.2

Some signs that should prompt a call to your pediatrician include if your baby is not suckling well and takes a long time to feed. Additionally, if you notice your baby doesn’t follow objects that are close by, doesn’t seem to blink when they see a bright light, or if they don’t seem to respond to sounds, you should get in touch with your doctor. Other concerns include if your baby continues to seem droopy, hasn’t gained strength since birth, or they don’t seem to move their arms and legs very often.2

Additional Behaviors

Some other milestones you may notice by the time your baby reaches 4 weeks include:

  • Begins to study your face2
  • May hold their hands in tight fists2
  • Gets excited when you speak or start signing2
  • Is beginning to extend their legs more often, rather than keeping them flexed6
  • Continues to have many of their newborn reflexes, including rooting, startling, and grasping6

4-Week-Old Baby Food

At four weeks old, your baby should be well over their birth weight and beginning to gain weight steadily, Dr. Johns says.6 As for feeding patterns, all babies are different, and you don’t really need to count feedings anymore or log every feeding as you might have in the early days. “Feeding is very variable at this age, and the most important metric is weight gain,” Dr. Johns recommends.

Dr. Posner suggests that parents continue to feed their babies responsively, and according to their baby’s cues. “I am a big fan of feeding on demand,” Dr. Posner says. “At this stage, most infants are good at knowing when they are full and when they are hungry.”

For breastfed babies, she recommends you feed your baby on demand. Most breastfed babies still feed about 8-12 times a day at this age.6 If you are formula feeding Dr. Posner recommends starting at 2 ounces and then increasing by an ounce at a time if your baby fusses or seems to want more.

Dr. Johns says that one of the top concerns she sees about baby feeding at 4 months old has to do with pooping patterns. When your baby was a newborn, they may have pooped very frequently, sometimes after every feeding. But it’s normal if things are starting to slow down by now.6

“Parents often ask about bowel patterns, and they can be very variable at this age, ranging from three times a day to three times a week, and all are normal,” Dr. Johns assures.

Another issue many parents grapple with at 4 weeks is spitting up. You can take heart knowing that spitting up is mostly just a laundry issue, and you can stock up on burp cloths now if you haven’t already!

“Spitting up is a big concern from most parents,” says Dr. Posner. “I explain that as long as the baby is gaining weight well and not in a lot of pain, this is normal.”

If your baby seems to be uncomfortable after feeding and/or is fussing, spitting up excessively, or arching their back as in pain after feeding, your baby may be experiencing infant reflux. If you suspect that your baby has reflux, you should speak to their pediatrician. They may suggest things like making sure to burp your baby after feeding, offering smaller, more frequent meals instead of larger ones, and holding your baby upright after feeding. In some cases, a medication that neutralizes stomach acid may be recommended by your doctor.7

4-Week-Old Baby Sleep

Sleeping is still one of your baby’s favorite pastimes at this age. You can expect a 4-week-old baby to sleep a little over 15 hours a day.1 This will be pretty evenly divided between night and day, though your baby may be moving toward doing a little more of that sleeping at night. Most babies this age sleep about 8-9 hours total at night, and about 7 hours total during the day.1

Your baby’s nighttime sleep is likely still broken up with frequent wake-ups, usually because of hunger.1 This is common, but it’s also normal to feel frustrated by this!

Dr. Posner says that the biggest question her patients have about sleep at this age is when their babies will sleep through the night. “They sleep a lot, but not in large stretches, so expecting them to sleep through the night at this age is a dream, not reality,” she says.

Some babies sleep longer stretches starting at 3 months, or when they have reached 12-13 pounds.1 But this varies tremendously, and some babies don’t start sleeping more soundly for several more months. Hang in there—your baby will get there soon enough.

Four weeks is still a time when you need to be extra cognizant of the danger of SIDS (Sudden Infant Death Syndrome). The AAP recommends that you keep your baby in your room at this age, but not in your bed. You should put your baby to sleep on their back on a firm mattress without any blankets, pillows, toys, or crib bumpers. At-home heart or breathing monitors are not recommended by the AAP.8

4-Week-Old Baby Schedule

At 4 weeks, while your baby doesn’t yet have a clearly defined schedule, you and your baby are probably starting to get into a bit of a routine. With your baby doing a little less sleeping during the day, and a little more sleeping at night, you might even be able to predict when your baby tends to need naps, and when they are more awake and alert.1

Now that your baby is becoming stronger and more aware of their surroundings, tummy time will become even more enjoyable. The AAP recommends that you do tummy time a few minutes at a time, several times a day.9 At this age, you can make it part of your daily routine.

You don’t need much equipment for tummy time, but as your baby gets older, they may enjoy a play gym that has mobiles or other bright patterns. Your baby may also enjoy a baby swing at this age during those more alert times of the day. Your baby may especially enjoy baby swings with bright lights and music.

4-Week-Old Baby Health and Safety

At 4 weeks old, your baby will have their first well baby visit since they were a few days old. This is an exciting moment for you and your little one.10

You are likely to have lots of questions about your baby’s growth and development. Your pediatrician will ask you questions about what your baby is doing at this age, and you can also come prepared to the visit with all your lingering questions. Don’t be afraid to voice any concerns you are having, big or small.

Vaccinations

At this visit, your baby will probably get their second Hepatitis B vaccination; however, some pediatricians give this vaccine at the two month visit.10 Your baby's next visit will be at 2 months.10 At the 4 week visit, you can take some time to ask your pediatrician what to expect at this next visit, and how to prepare.

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