A one-week-old baby typically drinks 1 to 2 ounces of breastmilk per feeding, adding up to roughly 10 to 20 ounces over a full 24-hour period. That range is wide because every baby is different, and the number of feedings per day matters more than hitting an exact ounce target. Here’s what’s happening in your baby’s body at this stage and how to tell if they’re getting enough.
Per-Feeding and Daily Totals
At one week old, most babies take in 1 to 2 ounces each time they feed. They eat frequently, typically 8 to 12 times in 24 hours, which means a feeding roughly every 2 to 4 hours around the clock. Multiply those small amounts across a full day and you get a total of about 10 to 20 ounces.
If you’re breastfeeding directly, you won’t know exactly how many ounces your baby takes per session, and that’s completely normal. Breastfeeding works on a supply-and-demand system: the more your baby nurses, the more milk your body produces. Counting ounces matters more when you’re pumping and bottle-feeding expressed milk. In that case, offering 1 to 2 ounces per bottle and feeding on your baby’s schedule (rather than on a rigid clock) keeps things close to what a breastfed baby would naturally take.
Why the Amounts Are So Small
A newborn’s stomach is remarkably tiny. At birth, it holds only about 1 to 2 teaspoons, roughly the size of a marble. By day 10, it grows to the size of a ping-pong ball, holding around 2 ounces. That physical limit is the reason small, frequent feedings are the norm. Trying to push larger volumes can lead to spitting up or discomfort because the stomach simply can’t hold more yet.
Your milk is also changing during this window. For the first few days after birth, your breasts produce colostrum, a thick, concentrated fluid packed with antibodies. Around days 2 through 5, colostrum gradually transitions into what’s called transitional milk. You may notice your breasts feeling fuller and warmer, and the milk shifting to a thinner, bluish-white color. This transitional phase lasts until about two weeks postpartum, when your mature milk fully comes in. The increasing volume of milk your body produces lines up with your baby’s growing stomach capacity.
What Weight Changes to Expect
It’s common for babies to lose up to 10% of their birth weight in the first week, mostly from fluid loss after delivery. A 7-pound baby, for example, might drop to about 6 pounds 5 ounces. This is expected and not a sign that your baby isn’t getting enough milk. Most babies begin regaining weight by the end of the first week and are back to their birth weight by about 10 to 14 days old. Your pediatrician will track this at early checkups, so you’ll have a clear picture of whether weight gain is on track.
How to Tell Your Baby Is Getting Enough
Since you can’t measure ounces at the breast, diaper output is the most reliable day-to-day indicator. After day 5, a well-fed newborn produces at least 6 wet diapers per day. The number of poopy diapers varies, but you should be seeing them regularly. Fewer wet diapers than that, or dark-colored urine, can signal that your baby needs more milk.
Your baby’s behavior also offers useful signals. Hunger cues include putting hands to the mouth, turning the head toward your breast (called rooting), puckering or smacking the lips, and clenching fists. These are early signs. Crying is actually a late hunger cue, so feeding before your baby reaches that point makes for calmer, more effective sessions.
When your baby is full, you’ll notice them closing their mouth, turning away from the breast or bottle, and relaxing their hands. Letting your baby lead the feeding, stopping when they show these signs rather than trying to get them to finish a set amount, helps prevent overfeeding and supports healthy intake patterns from the start.
Pumping and Bottle-Feeding at One Week
If you’re exclusively pumping or supplementing with pumped milk, aim to offer 1 to 2 ounces per bottle and let your baby signal when they want more. It’s better to start with less and offer a second small bottle than to fill a 4-ounce bottle and try to get your baby to finish it. Newborns fed by bottle can sometimes take in more than their stomach comfortably holds because the flow from a bottle nipple is more constant than from the breast.
To keep your supply matched to your baby’s needs, try to pump roughly as often as your baby would nurse, about 8 to 12 times per day. This frequency tells your body to keep producing milk at the volume your baby requires. As your baby grows and their stomach capacity increases over the coming weeks, both the amount per feeding and the total daily volume will rise naturally.