This post is part of our Complete 12 Month Guide to Baby Development. If you are just starting your journey, you can view the full roadmap here.https://cremedelacremechild.co/the-first-year-a-month-by-month-guide-to-your-childs-development/
Watching a newborn grow during the first month is one of those things I find both amazing and exhausting. Changes come at a rapid pace; sometimes it feels like you blink and your baby already seems different than the night before. If you’re a new parent, caregiver, or just curious about what to expect, tracking monthly baby milestones can be really helpful for reassurance (and to know when those little surprises, like the first smile, might show up!). And..Just in case you are a photo junkie!
What Develops in the First Month
The first month after birth is all about growing, feeding, sleeping, and adjusting to a whole new world. Most babies are focused on basic instincts and reflexes, but even in these early weeks, you’ll start seeing changes in how they move, interact, and respond to the world around them.
Here’s a quick view of the main areas where you’ll notice changes during this first month:
- Physical growth (weight, length, head size)
- Reflexes and basic motor skills
- Sensory developments (sight, sound, touch, smell, taste)
- Social and emotional cues
- Feeding and sleep patterns
Every baby is on their own timeline, so what you see might not match exactly with what a friend’s baby does at the same age. Differences between male and female babies at this age are usually minor; with males sometimes trending a bit heavier or longer, but these aren’t major factors for most milestones yet.
Physical Growth and Appearance
Newborns typically lose a little weight in the first few days (up to 10% of their birth weight), but most are back to their birth weight by the end of week two. After that, steady weight gain is normal. On average, babies gain about 5 to 7 ounces per week and grow about 1 to 1.5 inches in length during the first month. Head circumference will also increase as the brain grows.
- Male babies might be a little longer and heavier than females, but the differences are very small at this age. For example, average birth weight for boys is around 7.6 lbs. (3.4 kg) and girls about 7.2 lbs. (3.3 kg).
- Skin might peel a bit or look blotchy in newborns. Baby acne, tiny white spots (milia), or mild rashes may pop up; these are pretty typical and usually temporary.
Umbilical cord stumps usually dry up and fall off within two weeks. If you notice redness, swelling, or pus at the belly button, it’s smart to check with your doctor. Babies can also have a large stump sticking out about an inch. This is usually a hernia?
Motor Skills and Reflexes
In the first month, most of what your baby does is automatic; these are called newborn reflexes. Some things you might spot:
- Rooting Reflex: If you touch the baby’s cheek, they turn toward it, looking for a nipple.
- Moro Reflex A sudden movement or loud noise makes the arms fling out and then curl in.
- Grasp Reflex: Place a finger in their palm, and they’ll wrap their fingers around it.
- Stepping Reflex: When held upright on a flat surface, babies may make a stepping motion.
Head and neck muscles are still really weak. Newborns can turn their heads side to side when on their back and briefly lift their heads during tummy time (for a few seconds). Regular tummy time sessions (even just a few minutes at a time) help your baby develop stronger neck and shoulder muscles. Always keep a close eye on babies during tummy time. It can be dangerous to leave them alone because they are not strong enough to hold their head up for more than a couple of minutes.They can fall onto their face into a blanket. Sometimes they may not be able to turn their head to breathe.
Senses and Awareness
Sensory development is a big part of the newborn experience. A baby’s sight, sound, smell, taste, and touch are all active but still developing.
- Vision: Babies can focus about 8 to 12 inches away; the perfect distance to see your face while feeding. They see high-contrast shapes (black and white) and can briefly track slow moving objects.
- Hearing: Most babies know their parents’ voices and may startle with loud sounds. Soft singing or talking in a gentle tone helps calm them.
- Touch: Skin to skin time supports bonding, keeps baby warm, and is soothing.
- Smell and Taste: Newborns can sense the scent of their mother and prefer sweet smells (which matches with breast milk)
Over this first month, babies might start to quiet down or become more alert when hearing a familiar voice.
Sleep Habits and Patterns
Newborns sleep a lot; usually up to 16 to 18 hours a day, but rarely for more than 2 to 4 hours at a stretch. I’ve found this unpredictability can be tough for families, so don’t stress if your schedule feels upended! Our son was on a 3 hour schedule around the clock. Those 2 A.M. and 5 A.M. feedings were brutal in the beginning.
- Day and night confusion is totally normal. Some babies are most active at night, making sleep for parents a bit of a challenge.
- Expect a wide variation: some babies take lots of short naps, while others sleep a bit longer at a stretch.
Safe sleep is super important for newborns. Always lay your baby on their back in a crib or bassinet, with a firm mattress and no soft bedding, pillows, or toys near their face. Use a swaddle during the first month if you prefer.
Feeding Milestones
A one month old baby will usually eat every 2 to 4 hours, whether it’s breast milk or formula. That’s about 8 to 12 feedings in a 24 hour period. Wet and dirty diapers are a sign they’re getting enough nourishment (about 6 or more wet diapers a day by the second week, and several stools for most babies; although formula fed babies can sometimes poop less often).
- Males may eat slightly more if they are heavier, but overall, hunger cues matter more than gender. Look for signs like rooting, sucking motions, or hand to mouth activity to know when your baby is ready to feed.
- Spitting up a little after feeding is common; as long as your baby is growing and seems happy, there’s usually no need to worry. Burping your baby after feeding helps with the extra spit-up, and keeps it on the burp cloth.
If your baby isn’t waking for feeds (especially in the first couple weeks) or seems overly sleepy, a chat with your pediatrician is a smart step. Babies who aren’t putting on weight or seem lethargic may need extra attention.
Early Social and Emotional Milestones
Most newborns aren’t super social yet, but you might notice little ways they react to you. These are some first month social and emotional markers:
- Briefly looking at faces (especially yours and close family)
- Calming with touch, cuddling, or soothing sounds
- Startling at sudden movements or noises, then settling with comfort
- Crying as their main way to communicate hunger, discomfort, or needing attention
Many babies will start to show fleeting smiles by the end of the first month, but don’t be discouraged if it takes a little longer; sometimes those smiles are just gas, (still adorable!) but the real thing is right around the corner. (even more adorable!)
Basic Monthly Checklist: What to Look For~
- Back to birth weight by two weeks
- Gaining weight and growing in length and head size
- Responding to sounds and voices
- Briefly focusing on faces within close range
- Having lots of reflexes: sucking, grasping, Moro, rooting
- Moving arms and legs actively, but without much control
- Turning head side to side (sometimes during tummy time too)
- Peeing and pooping regularly
- Feeding every 2 to 4 hours (or more)
- Sleeping up to 18 hours in short stretches
If you have concerns about missing milestones (like not re-gaining weight, not responding to sounds, poor feeding, or low muscle tone), checking in with your pediatrician can set your mind at ease. Many babies just take their time, but it’s always better to ask if you’re unsure.
What’s Different Between Boy and Girl Babies?
In this first month, most development stays pretty much the same for both boys and girls. Any differences in weight or length at birth are usually minor and don’t cause different milestones. Growth charts published by the CDC and World Health Organization do split boys and girls for reference, but for home milestone checks, the month-to-month basics are shared by both sexes.
Hormones passed on from mom can sometimes cause baby boys’ testicles to appear larger or baby girls to have a bit of vaginal discharge or breast swelling for the first week or so. Both are normal and should fade quickly. Our son had very large testicles for a newborn. I was shocked and very concerned. Our pediatrician checked him and assured us that he was within the normal range.
Common Questions for Month One
Question: My baby sleeps all the time. Should I wake them to feed?
Answer: If your newborn is under two weeks and hasn’t regained birth weight, feeding every 2 to 3 hours around the clock is smart. After that, most healthy one month olds wake up on their own for feeds, but if you’re concerned, your doctor can give specific advice based on your baby’s growth.
Question: How do I know my baby can see or hear me?
Answer: Babies will startle at loud noises, calm with familiar voices, and often try to focus on faces or high contrast objects. Hearing screens at birth help catch most issues early, but always mention hearing or vision worries at wellbaby visits.
Question: Are there any red flags I should watch for?
Answer: If your baby isn’t gaining weight, never seems alert even after feeding, has trouble breathing, or you notice unusual movements, it’s very important to check in with your pediatrician. Trust your gut; new parents learn very fast, but you’re never expected to have all the answers right away.
Final Thoughts on Month One
The early weeks are a mix of sleepy feeds, tiny yawns, and so much learning (for you and your baby). Try to give yourself lots of grace and take pictures even when things feel messy. A month from now, you’ll be surprised by how much has changed already. The first month can feel overwhelming, but every little milestone is a sign your baby is growing and adjusting to the world—and so are you. Remember to soak in every cuddle, ask for help when you need it, and celebrate each small step along the way. And don’t forget those adorable photographs!! You will really be glad you took them, several months down the road, as you notice major changes in your baby.