How Much Should a Newborn Gain in the First Month? | By Week

A healthy newborn typically gains about 1 to 2 pounds in the first month, roughly 5 to 7 ounces per week.

The scale in the nursery gets watched like a stock ticker during the first few weeks home. A drop of a few ounces can feel like a red alert, especially when every visitor asks how much the baby weighs now. The truth is less dramatic than the worry suggests.

Here’s the reality: most newborns lose up to 8–10% of their birth weight in the first few days, then steadily regain it. By day 14, they’re typically back to birth weight. From there, the monthly total usually settles into a predictable range — about 1 to 2 pounds by the end of the first month, or roughly 5 to 7 ounces per week. That range holds true for most healthy, full-term babies.

Typical Weight Gain in the First Month

Most healthy, full-term newborns follow a predictable curve. In the first 3 to 5 days after birth, weight drops by up to 8–10% of birth weight — that’s normal fluid loss, not a feeding problem. By day 14, the baby should be back at or above their birth weight.

The Normal Newborn Weight Pattern

From that point through the end of the first month, the weekly pace settles into roughly 5 to 7 ounces per week. That adds up to about 1 to 2 pounds for the full four weeks. Mayo Clinic puts the daily average at about 1 ounce (28 grams) per day during these early months.

Some babies gain at the higher end, some at the lower end, and both can be perfectly healthy. The pace tends to stay steady for the first 3 to 4 months. Many babies double their birth weight by around 3 to 4 months, though individual timing varies.

Why the First Month Feels Like a Waiting Game

New parents want certainty — a number to aim for, a deadline to breathe. The first month of weight gain doesn’t offer hard guarantees, but it does offer reassuring patterns. Pediatricians look at the big picture across weeks, not a single weigh-in.

• Feeding method matters. Breastfed babies tend to gain weight a bit faster in the first 2 to 3 months compared to formula-fed babies, per the CDC. After the 3-month mark, the pattern shifts.
• Birth weight sets the baseline. A 9-pound baby and a 6-pound baby won’t gain at the same rate. What matters is that each follows their own growth curve, not how they compare to other babies.
• Initial weight loss varies. That 8–10% drop in the first few days is average, but some babies lose less and some lose slightly more. The key benchmark is regaining birth weight by day 14.
• Feeding frequency and efficiency play a role. Newborns who nurse or take a bottle 8–12 times per day and produce 6–8 wet diapers are generally getting enough milk, regardless of the exact ounces on the scale.
• Health and prematurity change the numbers. Preterm babies or those with medical conditions may have different gain targets set by their pediatrician. The ranges above apply to healthy, full-term newborns.

The important thing is that weight gain stays consistent over time. A baby who gains 4 ounces one week and 6 the next is still on track as long as the trend line points up. Growth happens in fits and starts, especially during the newborn period.

How to Track Newborn Gain the First Month

Tracking newborn weight gain doesn’t require a fancy system. Most parents jot down weights after pediatrician visits and watch for the broader patterns: regain birth weight by week two, then steady increases.

A quick reference for what typical monthly gain looks like in the first few months comes from Johns Hopkins Medicine, which notes that from 1 to 3 months, babies tend to gain 1½ to 2 pounds each month. That’s consistent with the 5–7 ounces per week range.

The table below gives a snapshot of weekly expectations across the first few months based on the range most pediatricians use.

The first month sits right in that 5–7 ounces per week sweet spot. If your baby is gaining within that range and has plenty of wet diapers, the numbers are likely right where they need to be.

Weight gain is just one signal. Pediatricians also look at length, head circumference, and overall development. A baby who’s alert, feeding well, and producing enough diapers is usually right on schedule.

Signs Your Baby Is Getting Enough Milk

Numbers on a scale are helpful, but they’re not the only way to know if feeding is going well. A few daily signals can give you a clear picture long before the next pediatrician visit. These signs tend to be more reassuring than a single weigh-in, and they’re backed by pediatric feeding guidelines.

1. Wet diaper count. Six to eight wet diapers per day is the standard marker for adequate intake in newborns. Less than six could mean the baby isn’t getting enough milk.
2. Feeding frequency and duration. Newborns typically nurse or take a bottle 8 to 12 times in 24 hours during the first month. Feeding sessions that last 10–20 minutes on each side or per bottle are common.
3. Alertness and contentedness. A well-fed newborn is typically alert during wakeful periods and content between feeds. Extreme sleepiness or constant crying can be cues to check in with your pediatrician.
4. Steady weight trajectory. While not a daily signal, seeing the weight trend upward at each pediatric visit — even if some weeks are slower than others — is a strong sign that intake is adequate.

These daily clues work together better than any single metric. A baby with enough wet diapers and a regular feeding rhythm is almost certainly getting what they need. If something feels off, a quick call to your pediatrician can sort things out.

Breastfed vs. Formula-Fed Weight Gain

Breastfeeding and formula feeding produce slightly different growth curves, especially after the first few months. The differences are well-documented but often smaller than parents expect. Understanding them can help you avoid the trap of comparing your baby’s gain to a friend’s baby who feeds differently. Both feeding methods support healthy development.

How Feeding Method Shapes Growth

Breastfed newborns tend to gain weight more quickly in the first 2 to 3 months compared to formula-fed babies, on average. After the 3-month mark, the CDC infant growth data shows a slower gain for formula-fed babies relative to breastfed babies. Both patterns are considered normal healthy growth, just on slightly different schedules.

This comparison can help you make sense of your baby’s growth against feeding method.

The important thing to remember is that healthy babies come in all sizes and growth paces. Your pediatrician will track which percentile your baby follows over time, not how their weight compares to a different baby on a different feeding plan. Consistency on your baby’s own curve is the real goal. Small variations from week to week are rarely cause for concern.

The Bottom Line

The typical newborn gains about 1 to 2 pounds in the first month, which breaks down to roughly 5–7 ounces per week after their birth weight is regained by day 14. That initial 8–10% weight drop is normal, not a crisis. Watching diaper counts, feeding cues, and the overall trend matters more than obsessing over a single weigh-in.

If your baby hasn’t regained birth weight by day 14 or is gaining well below the 5–7 ounce weekly range, your pediatrician can assess feeding efficiency, latch, and rule out underlying issues during those early well-baby visits.