A 4-month-old typically needs 24 to 32 ounces of milk per day, whether that comes from formula or breast milk. The exact amount varies by baby, but a simple weight-based formula can help you estimate: about 2.5 ounces of milk per pound of body weight per day. For an average 4-month-old weighing around 14 pounds, that works out to roughly 35 ounces, though most babies naturally cap themselves around 32 ounces.
Daily Totals for Formula-Fed Babies
The American Academy of Pediatrics recommends that formula-fed infants take in about 2.5 ounces per day for every pound they weigh. A 13-pound baby would need roughly 32 ounces, while a smaller or larger baby would fall slightly below or above that. Regardless of weight, babies generally should not exceed an average of 32 ounces of formula in 24 hours.
At 4 months, most formula-fed babies eat every 3 to 4 hours, which typically means 5 to 6 bottles a day. That breaks down to about 5 to 7 ounces per feeding, depending on how many bottles your baby takes. Some feedings will be bigger than others, and that’s normal. Babies are good self-regulators and will generally stop when they’ve had enough.
One milestone worth noting: most formula-fed babies over 12 pounds no longer need a middle-of-the-night feeding. If your baby is still waking to eat overnight, that’s fine, but you can also expect those nighttime feeds to naturally drop off around this age.
Daily Totals for Breastfed Babies
Breastfed babies are harder to measure in ounces since milk transfers directly. On average, exclusively breastfed 4-month-olds consume roughly 24 to 30 ounces of breast milk per day. Rather than tracking volume, the better guide is frequency: most breastfed babies this age nurse 8 to 12 times in 24 hours, roughly every 2 to 4 hours during the day, with one longer stretch of 4 to 5 hours at night.
If you’re pumping and bottle-feeding breast milk, the same 2.5-ounces-per-pound guideline gives a reasonable estimate. Just keep in mind that breast milk composition changes throughout the day, so your baby may take slightly different amounts at different feedings.
How to Tell If Your Baby Is Getting Enough
The most reliable signs that your baby is well-fed have nothing to do with measuring ounces. Steady weight gain at regular pediatric visits is the gold standard. Between visits, wet diapers are the best daily indicator. Six or more wet diapers in 24 hours typically signals adequate hydration.
Your baby also gives you real-time feedback at every feeding. Hunger cues at this age include putting hands to the mouth, turning toward the breast or bottle, lip smacking or licking, and clenched fists. When your baby is full, you’ll notice the opposite: closing the mouth, turning away from the breast or bottle, and relaxed, open hands. Pushing past these fullness signals by encouraging your baby to finish a bottle can lead to overfeeding.
The 4-Month Growth Spurt
Many babies hit a growth spurt around 4 months, and it can temporarily throw your feeding routine off. During a spurt, your baby may want to eat more frequently, sometimes as often as every 30 minutes for breastfed babies. They may also seem fussier than usual and harder to satisfy. This can feel alarming, especially if you’re breastfeeding and suddenly wondering whether your supply is keeping up.
Growth spurts typically last only a few days. For breastfeeding parents, the increased nursing actually signals your body to produce more milk, so the best response is simply to follow your baby’s lead. For formula-feeding parents, you can offer an extra ounce or two per bottle during these stretches. If your baby consistently seems to want more than 32 ounces a day beyond a short growth spurt, it’s worth mentioning at your next pediatric visit.
No Water or Solids Yet
At 4 months, breast milk or formula should be your baby’s only source of nutrition. The AAP and the Dietary Guidelines for Americans both recommend waiting until about 6 months to introduce solid foods, and introducing foods before 4 months is specifically not recommended. Even babies who seem very interested in watching you eat are not developmentally ready for solids at this age.
Water is also off the table for now. The AAP recommends waiting until around 6 months to offer small sips of water (4 to 8 ounces per day at that point). Before then, breast milk and formula provide all the hydration your baby needs. Giving water to a young infant can fill their stomach without providing calories or nutrients, and in larger amounts, it can dilute the sodium in their blood to dangerous levels.
Quick Reference by Feeding Type
- Formula-fed: About 24 to 32 ounces per day, split across 5 to 6 bottles of 5 to 7 ounces each, every 3 to 4 hours.
- Breastfed: 8 to 12 nursing sessions per day, every 2 to 4 hours, with a possible 4- to 5-hour stretch at night.
- Pumped breast milk: Use the 2.5 ounces per pound of body weight calculation, typically landing between 24 and 32 ounces daily.