A 9-month-old needs roughly 24 to 32 ounces of breast milk or formula per day, spread across three to five feedings. That milk should still be the primary source of nutrition at this age, but solids are gradually taking up a bigger share of the plate.
Daily Milk Amounts by Type
Whether your baby is breastfed, formula-fed, or getting a combination, the target range is similar. Stanford Medicine Children’s Health recommends 30 to 32 ounces per day for babies between 9 and 12 months, while the American Academy of Pediatrics places the figure around 24 ounces (720 mL) for the 8-to-12-month window. The difference reflects how much solid food your baby is actually eating. A baby who enthusiastically eats three meals of solids will naturally drink a bit less milk than one who’s still warming up to food.
For breastfed babies, measuring ounces isn’t practical. Instead, aim for three to five nursing sessions spread through the day. Most 9-month-olds settle into a pattern of nursing in the morning, before or after naps, and at bedtime, with solid meals filling in the gaps.
How Milk and Solids Fit Together
At 9 months, your baby needs between 750 and 900 calories a day. About 400 to 500 of those calories should still come from breast milk or formula, with the rest coming from solid foods. That’s roughly a 55/45 split favoring milk, though some babies lean more heavily on solids by this point and others still prefer the bottle or breast.
A common approach is to offer milk first thing in the morning, then solid food at breakfast, lunch, and dinner, with milk feedings before or after naps. Some parents find that offering solids before milk encourages the baby to eat more food, while others prefer the reverse. Either order works. What matters is that your baby gets both throughout the day rather than filling up entirely on one or the other.
Why Too Much Milk Can Be a Problem
It sounds counterintuitive, but giving a 9-month-old too much milk can actually cause nutritional problems. Babies who drink well beyond 32 ounces a day tend to feel full and lose interest in solid foods. That matters because breast milk and formula alone don’t provide enough iron for a baby this age. Iron-rich solids like fortified cereal, pureed meats, and beans need to become a regular part of the diet.
Excessive milk intake can also interfere with the body’s ability to absorb iron from the foods your baby does eat. In some cases, large volumes of milk can irritate the digestive tract and lead to small amounts of internal bleeding, which worsens iron loss. If your baby seems uninterested in solids and is drinking significantly more than 32 ounces of milk daily, it’s worth discussing with your pediatrician.
Cow’s Milk Is Not Recommended Yet
At 9 months, the only milk your baby should be drinking is breast milk or infant formula. The American Academy of Pediatrics recommends waiting until after a baby’s first birthday to introduce whole cow’s milk. Cow’s milk is low in iron and, in large amounts, blocks iron absorption from other foods. It also contains protein and mineral concentrations that are harder for a young baby’s kidneys to process. Small amounts of dairy in cooked foods or yogurt are generally fine at this age, but cow’s milk should not replace formula or breast milk as a drink until 12 months.
What About Water?
Babies between 6 and 12 months can have 4 to 8 ounces of water per day, according to the CDC. That’s a small amount, just enough to help wash down solids and get your baby used to drinking from a cup. Water shouldn’t replace any milk feedings. Juice is unnecessary and best avoided entirely at this age.
Signs Your Baby Is Getting Enough
Tracking exact ounces isn’t always possible, especially for breastfed babies. Instead, look at the bigger picture. A baby getting enough milk will produce at least six wet diapers in a 24-hour period. They’ll appear alert and active when awake, and they’ll follow a steady growth curve at well-child checkups.
During nursing, you can watch for a few specific cues. Your baby should start with quick sucks that transition into long, rhythmic sucks and swallows. You should be able to hear swallowing. Their cheeks should stay rounded rather than hollowing inward, and they should seem calm and relaxed while feeding. A baby who pulls off the breast or pushes the bottle away after a reasonable feeding is likely satisfied, not underfed.
Steady weight gain remains the most reliable indicator. Your pediatrician tracks this at each visit, but if your baby seems content between feedings, is meeting developmental milestones, and is producing plenty of wet diapers, their milk intake is almost certainly on track.