1-month-old baby: Development, milestones & growth (2024)

Your 1-month-old is still a sleepy newborn adjusting to the world, but by the end of the month your little one may be much more alert and engaged.

Life with a 1-month-old can be a magical time full of sweet baby smells and snuggles, but it's also one of the most intense adjustment periods you'll both ever go through. Your baby is learning the basic functions of life: how to sleep, eat, communicate, and move.

You're adjusting, too. You're learning how to soothe your baby; getting into a routine of constant feedings, naps, and diaper changes, and discovering the best way to get your baby to sleep and exactly how they like to be held. You've both come a long way, and you still have a lot of learning to do together.

Advertisem*nt | page continues below

Your baby's development

Your 1-month-old baby is still very much a newborn – sleeping, eating, and pooping at all hours of the day and night, and not doing much else. That's to be expected. Your goals are to get sleep when you can, ensure your baby is growing appropriately, and continue to learn your baby's eating and sleeping cues so you can help encourage a more consistent baby schedule in the future.

By the end of the month, your baby may seem to wake up to the world, and become much more engaged and alert. Your 1-month-old's movements may seem more coordinated and smoother. Also, your little one will be working on communicating with you through facial expressions and – of course – crying. You'll notice that your 1-month-old is watching your face when you hold them close and listening to your voice. You help develop your baby's brain by talking, singing, reading, and playing – interacting is key to building a healthy foundation for your little one.

1-month-old milestones

Milestones for a 1-month-old vary a lot, especially if your baby was born early. So, keep in mind that there can be a wide range of when your baby will meet milestones. It doesn't necessarily mean that something is wrong if your baby hasn't met a milestone yet, especially at this age. But be sure to attend your baby's doctor visits and stay in touch with your baby's care provider so you can address any concerns early on.

Here are a few of the milestones your 1-month-old baby may reach:

  • Facial expressions. Your baby may not be able to talk yet, but that little face sure is telling you a lot. You'll see your baby experimenting more with different facial expressions – pursing their lips, raising their eyebrows, widening or squinting their eyes, and furrowing their brow.
  • Smell recognition. This one has been present since birth: Your baby can recognize your scent, and if you're nursing, the unique smell of your breast milk.
  • Responding to loud noises. Your baby will respond to loud noises by acting startled or crying, just like older babies. (If you notice that your 1-month-old doesn't react to loud noises, tell your baby's doctor.)
  • Mature hearing. Your baby's hearing is fully developed. They can hear everything you can, and will even turn towards familiar voices and sounds. Your baby recognizes your voice and your partner's voice, and may even stop crying to listen when you speak!
  • Reflexes. All of the newborn reflexes – including the startle, rooting, sucking, and grasping reflexes – are still going strong. Most newborn reflexes disappear when your baby is about three months old.
  • Better eyesight. Your baby's eyesight is continuing to improve. You may notice that your baby's eyes cross occasionally – that's normal. Babies this age enjoy looking at high-contrast patterns, especially black and white, because they're easiest for them to see. Your baby also loves to see your face. When you hold your baby close – about 8 to 12 inches from your face – your baby can focus on it.
  • Head control. Your baby's neck muscles are getting stronger, and they may be able to hold their head up for brief moments. When practicing tummy time, your baby may even be able to lift their head and turn it from side to side.

1-month-old weight and length

In only a month, your baby has packed on some serious weight. In fact, from birth to the tender age of 1 month old, babies gain more than 2 pounds on average. Considering that two pounds is more than a quarter of a typical newborn's total body weight, that's an impressive amount.

So how big is a 1-month-old baby? Here are the averages:

Advertisem*nt | page continues below

Baby boys

Average weight for a 1-month-old: 9 pounds 15 ounces
Average length for a 1-month-old: 21.5 inches

Baby girls

Average weight for a 1-month-old: 9 pounds 4 ounces
Average length for a 1-month-old: 21 inches

Keep in mind that all babies grow at different rates, and there is a lot of variation in the way 1-month-olds develop. Some babies may struggle with feeding and need a little more time to catch up while others go through rapid growth spurts.

The most important thing you can do to make sure your baby's growth is on track is to attend your baby's 1-month well-baby visit. Your baby's doctor will track their individual growth on a growth chart.

1-month-old feeding

There isn't much difference between newborn feeding and 1-month-old feeding. At 1 month, your baby is still a newborn and needs round-the-clock feeding.

Advertisem*nt | page continues below

So how much does a 1-month-old eat? If you're breastfeeding, your baby will still nurse about every 2 to 3 hours – 8 to 12 times daily. Many 1-month-olds nurse for around 15 to 20 minutes at a time. However, that's a generalization. Some babies prefer cluster feedings (when they nurse multiple times within a shorter time frame), and some babies may take longer at the breast.

Keep feeding your baby on demand – look for your baby's early hunger cues (like rooting for your breast, smacking their lips, or sucking on their hands) and feed your baby whenever they seem hungry. This can be tough to figure out at first, but eventually you'll be able to easily tell when your baby needs to eat.

If your baby is drinking from a bottle – breast milk or formula – you can expect to feed them about 4 ounces every 3 to 4 hours. It can be better to start with smaller feedings until you determine how much your baby drinks so you don't waste formula or breast milk. If your baby doesn't finish the bottle of formula within an hour, you need to toss it because it could become contaminated. If your baby doesn't finish a bottle of breast milk, you can still give it to them within two hours.

Should you wake your baby up to feed? If your baby is struggling to gain weight or needs extra nutrition for any medical reason, waking to feed may be crucial. But at 1 month old, some babies can sleep for longer stretches of about 4 to 5 hours and don't need to be woken up to eat. If you're wondering, ask your baby's doctor.

The best way to ensure that your baby is getting enough to eat is to monitor their weight gain, which your baby's care provider will do at the well-baby checkup this month. You can also keep an eye on your baby's diapers – look for at least 5 to 6 wet diapers per day.

Advertisem*nt | page continues below

At first, your breastfed baby may have pooped after every feeding. That will likely slow down – in fact, some breastfed babies only poop every few days or even just once a week. Formula-fed babies should poop at least once a day.

1-month-old sleep

At 1 month old, your baby will sleep anywhere from 14 to 17 hours every 24 hours. For many babies, it works out to 15.5 hours, with 8 to 9 hours of nighttime sleep and 7 hours of daytime sleep.

However, 1-month-olds don't typically sleep many hours in a row. It's normal for babies to have irregular sleep patterns from birth to 3 months. Your baby could catnap for 20 to 30 minutes, or take a longer nap for a couple of hours.

It can be frustrating (and exhausting) when your baby's sleep doesn't follow a predictable pattern, but it will get better. It's too early for your baby to be on a strict schedule, though you can check out these sample baby sleep schedules to get an idea of typical routines for 1-month-olds.

It's not too early to encourage healthy sleep habits. Give your baby a chance to nap frequently, and teach your baby the difference between night and day. During the day, play and interact with your baby as much as you can and keep the house brightly lit. At night, keep your interactions quiet and the lights and noise level low.

Advertisem*nt | page continues below

You can also start a bedtime routine with your baby that may include bath time, baby massage, singing a special song, rocking, snuggling, and swaddling. A consistent routine will help teach your baby when it's time to sleep.

Your baby's health

It's time for another well-baby checkup! Your baby will see the doctorthis month, then again next month for a 2-month checkup. After that, visits will be every 2 months until your baby is a year old.

That may seem like a lot of visits, but they're worth it. Your baby's doctor will make sure they're growing appropriately, address any concerns, and answer your questions.

Here's what you can expect from your baby's 1-month-old checkup:

  • A full physical assessment. The doctor will check your baby's entire body and listen to their heartbeat, lungs, and stomach. They'll also check your baby's weight, length, and head circumference and plot it on a growth chart.
  • A look at your baby's diaper area. The doctor will check your baby's circumcision site, if applicable, and make sure that your baby's genitals look okay. They'll also check whether your baby is having any issues with diaper rash.
  • A discussion about infant safety. The doctor will ensure that you're following recommended guidelines to keep your baby healthy and safe, including starting tummy time and following safe sleep practices.
  • Vitamin D drops if you're breastfeeding. It's recommended that you give your breastfed baby vitamin D drops every day starting at birth. Your baby's doctor can give you a dropper to use.
  • Vaccines. Your baby may receive a second dose of the hepatitis B vaccine at the 1-month visit. If your baby didn't have the first hepatitis B vaccine already, you can start the series now. And your baby may be eligible for the RSV (respiratory syncytial virus) shot.

Advertisem*nt | page continues below

Your baby's doctor may also ask questions about how you're doing at the 1-month checkup to check for symptoms of postpartum depression. Sometimes it can be hard to tell the difference between the baby blues, postpartum depression, and the normal stress and exhaustion of being a new parent. Talk to your baby's doctor or another healthcare professional if you're:

  • having feelings of sadness, emptiness, or hopelessness
  • having trouble sleeping or concentrating
  • feeling overwhelmed
  • crying a lot
  • having severe mood swings
  • having trouble bonding with your baby
  • having thoughts of harming yourself or your baby

Your 1-month-old baby: Week by week

Want to learn more about what's happening with your baby this month? Get more details on your 1-month-old's weekly development:

  • 4 week old baby
  • 5 week old baby
  • 6 week old baby
  • 7 week old baby
1-month-old baby: Development, milestones & growth (2024)
Top Articles
Latest Posts
Article information

Author: Neely Ledner

Last Updated:

Views: 6306

Rating: 4.1 / 5 (42 voted)

Reviews: 81% of readers found this page helpful

Author information

Name: Neely Ledner

Birthday: 1998-06-09

Address: 443 Barrows Terrace, New Jodyberg, CO 57462-5329

Phone: +2433516856029

Job: Central Legal Facilitator

Hobby: Backpacking, Jogging, Magic, Driving, Macrame, Embroidery, Foraging

Introduction: My name is Neely Ledner, I am a bright, determined, beautiful, adventurous, adventurous, spotless, calm person who loves writing and wants to share my knowledge and understanding with you.