How Many Ounces Does A Newborn Drink? Facts

Newborns drink very small amounts at first. On day one, a healthy full-term newborn typically takes about half an ounce to one ounce per feeding. By the end of the first week, that amount usually grows to around one to two ounces per feeding, and it keeps climbing from there as the baby grows.

That is the short answer. The longer answer involves understanding how a newborn’s stomach capacity changes day by day, why feeding amounts are not one-size-fits-all, and how to tell whether your baby is getting enough. This guide walks through all of it in plain terms.

How Many Ounces Does a Newborn Drink in the First Week?

A newborn’s intake changes dramatically over the first seven days. The amounts are small because the stomach is small. On day one, a newborn’s stomach holds roughly 5 to 7 milliliters, which is about the size of a cherry. By day three, it holds about 22 to 27 milliliters, closer to the size of a walnut. By day ten, it can hold about 60 to 80 milliliters, roughly the size of a ping-pong ball.

Here is how that translates into feeding amounts for a full-term, healthy newborn:

• Day 1: About 0.5 to 1 ounce per feeding
• Day 2: About 1 ounce per feeding
• Day 3: About 1 to 1.5 ounces per feeding
• Day 4 to 5: About 1.5 to 2 ounces per feeding
• Day 6 to 7: About 2 to 2.5 ounces per feeding

These are general ranges. Some babies eat a little more or less at each feeding and cluster their feeds differently. What matters more than any single feeding number is the total intake over 24 hours and steady weight gain.

Colostrum, the thick first milk, comes in very small volumes. That is normal and expected. A newborn does not need large amounts in the first days. The frequent feeding itself helps bring in mature milk and supports the baby’s blood sugar and hydration.

How Much Should a Newborn Eat by Two Weeks and One Month?

By the time a baby is two weeks old, intake typically settles into a more predictable pattern. Most newborns take about 2 to 3 ounces per feeding by two weeks. By one month, many take about 3 to 4 ounces per feeding.

Over a full 24 hours, a common range for a newborn in the first month is roughly 16 to 24 ounces. Again, this is a range, not a target to hit precisely. Some babies take slightly more, some slightly less.

Formula-fed babies often follow a simple rule of thumb: about 2.5 ounces of formula per pound of body weight per day. So a 8-pound baby might take around 20 ounces in 24 hours. This is a general guideline, not a strict prescription. Breastfed babies are harder to measure in ounces because they feed directly at the breast, but they tend to follow a similar overall pattern of intake.

One thing that surprises many parents: a newborn’s feeding amounts do not increase in a straight line. There are growth spurts, often around two to three weeks and again around six weeks, when a baby may want to feed more often and take more per feeding for a few days. That is normal.

How Often Should a Newborn Eat?

Newborns eat often. In the first weeks, most feed every two to three hours, which works out to about 8 to 12 feedings in 24 hours. Some babies cluster their feeds, taking several close together and then sleeping a longer stretch.

In the first few days and weeks, it is generally recommended not to let a newborn go more than about four hours between feedings, even at night. This is because newborns need frequent intake to stay hydrated, maintain blood sugar, and gain weight. Once a baby is gaining well and back to birth weight, some clinicians say it is fine to let them sleep a bit longer at night, but this is a conversation to have with your baby’s doctor.

Watch the baby, not just the clock. Early hunger cues include rooting, sucking on hands, and smacking lips. Crying is a late hunger cue. Feeding before a baby gets frantic usually makes the feed go more smoothly.

How Can You Tell If a Newborn Is Getting Enough?

Ounces are only one way to measure intake. For breastfed babies especially, the more reliable signs are output and growth. Here is what to look for:

• Diapers: By day five or six, a newborn should have at least six wet diapers a day and several stools. Stool color transitions from dark and sticky to yellow and seedy in the first week.
• Weight: Newborns typically lose some weight in the first days, then regain it. Most are back to birth weight by about two weeks.
• Feeding behavior: A baby who latches well, sucks rhythmically, and seems content after feeds is usually getting enough.
• Alertness: A well-fed baby is generally alert and responsive when awake.

If a baby is not producing enough wet diapers, is very sleepy at feeds, or is not gaining weight, that is a reason to contact a pediatrician promptly. Do not wait it out.

Why Do Feeding Amounts Vary So Much Between Babies?

No two newborns eat exactly the same. Several factors explain the differences:

• Birth weight and size: Larger babies often take more per feeding than smaller ones.
• Feeding method: Bottle-fed babies may take more at once because the flow is steady. Breastfed babies may feed more frequently in smaller amounts.
• Growth spurts: Intake rises temporarily during rapid growth periods.
• Individual appetite: Some babies are simply hungrier than others.
• Prematurity or health conditions: Babies born early or with certain health issues may have different feeding needs and should follow guidance from their care team.

The ranges above are helpful as a general map, but they are not a scorecard. A baby who eats a little less than the range but is gaining weight and thriving is doing fine.

What About Overfeeding or Underfeeding?

Underfeeding is the bigger concern in the newborn period, especially in the first week. Signs include too few wet diapers, dark urine, excessive sleepiness, and poor weight gain. If you notice these, call your baby’s doctor.

Overfeeding is possible, particularly with bottle feeding. A bottle makes it easy for a baby to keep drinking past fullness because the milk keeps flowing. Paced bottle feeding, where you hold the bottle more horizontal, let the baby set the pace, and pause for breaks, can help. Signs a baby has had enough include turning away, slowing down, or pushing the bottle out.

Spitting up a small amount after feeds is common and usually not a sign of overfeeding. Forceful or frequent vomiting is different and worth mentioning to a doctor.

For breastfed babies, true overfeeding is uncommon because the baby controls the flow at the breast and stops when full.

When Should You Talk to a Doctor About Feeding?

Contact your baby’s pediatrician or a lactation consultant if you notice any of the following:

• Fewer than six wet diapers a day after the first week
• No weight gain or weight loss after the first two weeks
• Extreme sleepiness during feeds or difficulty waking to eat
• Refusing to feed for several hours
• Forceful vomiting or blood in the stool
• Signs of dehydration, such as a sunken soft spot or dry mouth

Feeding questions are common and not a sign of failure. Getting support early usually makes a real difference.