A one-week-old baby typically eats 1.5 to 2 ounces per feeding, about 8 to 12 times in a 24-hour period. That works out to roughly 12 to 24 ounces total per day, though the exact amount varies from baby to baby. The key is understanding what’s normal at this stage, how to tell if your baby is getting enough, and what to watch for if they’re not.
Why the Amount Is So Small
A one-week-old’s stomach is about the size of an apricot, holding just 45 to 60 milliliters (1.5 to 2 ounces) at a time. That’s a dramatic increase from birth, when the stomach was closer to the size of a cherry and held roughly a teaspoon. This rapid growth in stomach capacity is why feeding amounts change noticeably even within the first few days of life.
Because the stomach is still tiny, your baby needs to eat frequently to get enough nutrition. Feedings every 2 to 3 hours, including overnight, are completely normal and necessary. Most newborns settle into a pattern of 8 to 12 feedings per day during this first week.
Formula-Fed vs. Breastfed Babies
If your baby is formula-fed, aim to offer 1 to 2 ounces per feeding every 2 to 3 hours. You can measure this precisely using bottle markings, which makes tracking intake straightforward. Let your baby set the pace rather than pushing them to finish a specific amount. If they consistently drain the bottle and still seem hungry, it’s fine to offer a little more.
Breastfed babies are harder to measure in ounces because you can’t see how much milk they’re transferring from the breast. Instead of tracking volume, focus on feeding duration and frequency. A feeding session typically lasts 10 to 20 minutes per breast. If your baby consistently stops nursing after less than 10 minutes, that can be a sign they’re not latching well or transferring milk effectively. Breastfed newborns tend to eat slightly more often than formula-fed babies because breast milk digests faster than formula.
How to Tell Your Baby Is Getting Enough
Since you can’t always measure exactly how much your baby takes in, diaper output is the most reliable indicator. By day five and beyond, a well-fed newborn produces at least six wet diapers per day. Fewer than four wet diapers in 24 hours is a warning sign of inadequate intake.
Weight is the other major marker. It’s normal for babies to lose up to 10% of their birth weight in the first few days, mostly from fluid loss. By the end of the first week, your baby should be starting to regain that weight. Your pediatrician will check this at the first well-baby visit, which is usually scheduled within a few days of leaving the hospital.
Recognizing Hunger Before Crying
Crying is actually a late hunger signal. By the time a newborn is wailing, they’re already frustrated, which can make latching or settling onto a bottle more difficult. Earlier, calmer signs of hunger include:
- Rooting: turning their head toward your breast or the bottle
- Hand-to-mouth movement: bringing fists up to their face or sucking on their fingers
- Lip signals: smacking, licking, or puckering their lips
- Clenched fists: tightly balled hands often indicate hunger, while relaxed, open hands suggest fullness
Responding to these early cues makes feedings smoother for both of you. A calm baby latches more easily and feeds more efficiently.
Signs Your Baby May Not Be Eating Enough
Some red flags go beyond a simple low diaper count. Pay attention if your baby seems hungry and is searching for something to suck shortly after finishing a feeding, since this suggests they didn’t get enough during the session. Infrequent or very hard stools in the first month can also point to underfeeding.
Jaundice, the yellowish tint many newborns develop, normally fades during the first week. If your baby is becoming more yellow rather than less as the week goes on, inadequate feeding may be part of the problem, since frequent feeding helps flush out the bilirubin that causes the yellow color. Sleepiness that seems excessive, where your baby is difficult to wake for feedings or shows little interest in eating, is another concern worth raising with your pediatrician.
Night Feedings Are Essential
At one week old, your baby needs to eat overnight. Going long stretches without feeding can lead to dehydration and reduced urine output. Most newborns wake on their own to eat, but some very sleepy babies need to be roused. If your baby is sleeping longer than 3 to 4 hours without feeding during this early period, gently wake them. This is temporary. As babies grow and their stomachs hold more, the stretches between feedings naturally lengthen.
How Intake Changes Over the Coming Weeks
Feeding amounts increase quickly. By two weeks, many babies are taking 2 to 3 ounces per feeding. By one month, 3 to 4 ounces is typical. The frequency gradually decreases as the volume per feeding goes up, so you’ll eventually move from 10 or 12 feedings a day to something closer to 6 to 8. Your baby’s appetite will fluctuate day to day, and growth spurts (often around 2 to 3 weeks) can temporarily spike demand. During a growth spurt, your baby may want to eat more frequently for a day or two before settling back into their usual pattern.