Most breastfed babies need 24 to 30 ounces of breast milk per day between 1 and 6 months of age, split across however many feedings they take. The simplest way to figure out how much to put in each bottle is to divide that daily total by the number of times your baby eats in 24 hours.
The Basic Bottle Calculation
A baby who eats 8 times a day needs about 3 ounces per bottle (24 ÷ 8). A baby who eats 12 times a day needs closer to 2 ounces per bottle (24 ÷ 12). Most babies in the 1 to 6 month range take 3 to 4 ounces per feeding. This range stays remarkably stable throughout those months, which surprises many parents. Unlike formula-fed babies, whose intake increases steadily with weight, breastfed babies tend to plateau around 25 ounces a day because breast milk composition changes as the baby grows.
Start on the lower end of that range and let your baby tell you if they want more. It’s easier to offer an extra ounce than to waste milk you worked hard to pump.
The First Two Weeks Are Different
Newborns have tiny stomachs. At birth, your baby’s stomach 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 about 2 ounces. During those early days, very small, frequent feedings are normal. Offering half an ounce to an ounce at a time is plenty for the first few days, gradually increasing as your baby shows signs of wanting more.
By the end of the second week, most babies are working their way up to 2 to 3 ounces per feeding. Don’t rush this progression. Overloading a newborn stomach leads to spit-up and discomfort.
After 6 Months: When Solids Enter the Picture
Breast milk remains the primary source of nutrition from 6 to 12 months, but solid foods gradually make up a bigger share of your baby’s diet. You’ll likely notice your baby drinking slightly less milk per bottle as they eat more table food. There’s no exact formula for this reduction since every baby takes to solids at a different pace. The key is to continue offering breast milk at regular intervals and let your baby’s appetite guide how much they drink.
How to Avoid Overfeeding With a Bottle
Babies drink faster from a bottle than from the breast, which makes it easy to accidentally push past fullness. A technique called paced bottle feeding gives your baby more control over the speed and volume of a feeding. It’s straightforward:
- Use a slow-flow nipple. This prevents milk from flowing too fast regardless of your baby’s sucking strength.
- Hold your baby nearly upright with their head and neck supported. Keep the bottle horizontal, tilted just enough that the nipple is about half full of milk.
- Let your baby initiate. Touch the nipple to their cheek or upper lip and wait for them to open wide rather than pushing it in.
- Pause when your baby pauses. If you see gulping, wide eyes, splayed fingers, or milk leaking from the corners of their mouth, tip the bottle down so the nipple empties but stays in their mouth. Bring it back up when they start sucking again.
- Stop when your baby stops. Slowed or paused sucking, turning away, or falling asleep all mean the feeding is over.
A paced feeding typically takes 15 to 30 minutes. Your baby does not need to finish the bottle. Forcing the last half-ounce can stretch their stomach’s sense of fullness over time, which is the opposite of what you want.
Reading Your Baby’s Fullness Cues
Babies under 5 months show fullness by closing their mouth, turning their head away from the bottle, or relaxing their hands (clenched fists during feeding often signal active hunger). Older babies, from about 6 months on, get more obvious: they’ll push the bottle away, close their lips when you offer it, or use sounds and gestures to say they’re done.
These signals are more reliable than the number of ounces left in the bottle. Some feedings your baby will drain 4 ounces, others they’ll quit at 2. This is normal and mirrors how direct breastfeeding works, where you never know the exact volume.
Storing Pumped Milk Safely
Freshly pumped milk stays safe at room temperature (77°F or cooler) for up to 4 hours. In the refrigerator, it lasts up to 4 days. In the freezer, 6 months is ideal, though up to 12 months is acceptable. Label every bag or bottle with the date so you can use the oldest milk first.
If your baby regularly leaves an ounce in the bottle, try prepping smaller portions. Once your baby’s mouth has touched the bottle, leftover milk needs to be used within 2 hours or discarded. Storing milk in 2-ounce increments gives you flexibility to thaw or warm just what you need and add more if your baby is still hungry.