A 9-month-old typically needs about 24 ounces (720 mL) of formula per day, spread across four to five bottles. That’s noticeably less than what your baby was drinking a few months ago, and the reason is simple: solid foods are now picking up a larger share of their daily calories.
Daily Formula Amount at 9 Months
The American Academy of Pediatrics recommends that 8- to 12-month-olds get roughly 400 to 500 calories a day from formula, which works out to about 24 ounces. A typical day looks like four to five bottles of 4 to 6 ounces each, with one slightly larger bottle of 6 to 8 ounces before bedtime. Your baby’s total daily intake will land somewhere between 20 and 28 ounces depending on how much solid food they’re eating.
At this age, your baby needs between 750 and 900 total calories per day. Formula covers roughly half of that, with solid foods making up the rest. Earlier in the solids journey, food provided only about a third of daily calories. By 9 months, that balance is shifting closer to even, and it will continue tilting toward food as your baby approaches their first birthday.
A Typical Feeding Schedule
Most 9-month-olds eat five to six times in a 24-hour period, combining formula and solids. A sample day might look like this:
- Breakfast: 4 to 6 ounces of formula, plus solid food
- Mid-morning snack: 4 to 6 ounces of formula
- Lunch: 4 to 6 ounces of formula, plus solid food
- Dinner: 4 to 6 ounces of formula, plus solid food
- Before bed: 6 to 8 ounces of formula
You don’t need to follow this exactly. Some babies prefer smaller, more frequent bottles alongside their meals, while others consolidate into fewer, larger feedings. The total amount over 24 hours matters more than the exact timing.
Why Formula Intake Drops at This Age
If your baby is drinking less formula than they did at 6 or 7 months, that’s expected. As babies get better at eating solid foods, they naturally cut back on formula. A 4-month-old might take 30 to 32 ounces a day, but by 9 months, many babies are closer to 24 ounces or even a bit less.
The key is that total nutrition stays adequate. If your baby is gaining weight appropriately, having regular wet diapers, and showing energy and alertness, they’re getting enough even if the bottle amounts seem lower than before. Trying to push formula beyond what your baby wants can actually work against building healthy eating habits with solids.
Reading Your Baby’s Hunger and Fullness Cues
At 9 months, your baby can communicate hunger and fullness more clearly than they could as a newborn. Signs that your baby is done with a bottle or meal include pushing the bottle away, turning their head, closing their mouth, or using hand motions and sounds to signal they’ve had enough. Respecting these cues helps your baby learn to self-regulate their appetite.
On the flip side, reaching for the bottle, opening their mouth, or getting fussy between feedings can signal hunger. Some days your baby will drink more formula, other days less. Growth spurts, teething, and even the type of solid foods you’re offering can all shift how much formula your baby wants on any given day.
Nighttime Bottles at 9 Months
Most formula-fed babies no longer need nighttime feedings by 9 months. Formula-fed infants at this age typically need zero to one feeding overnight, and many have already dropped night bottles entirely. If your baby is still waking for a bottle, it may be more about habit or comfort than hunger, especially if they’re eating well during the day.
Pediatric guidance generally suggests weaning off nighttime feedings by 8 to 9 months, or sooner if your baby is ready. Gradually reducing the amount in the nighttime bottle by an ounce every few nights is one common approach.
Water and Other Drinks
Between 6 and 12 months, babies can have 4 to 8 ounces of plain water per day. This is in addition to formula, not a replacement for it. Water helps with hydration as your baby eats more solid foods, particularly foods with fiber. Offer small sips from an open cup or straw cup at mealtimes rather than giving a full bottle of water.
Juice, cow’s milk, and plant-based milks are not recommended before 12 months. Formula (or breast milk) remains the primary drink until your baby’s first birthday.
Signs Your Baby Is Getting Enough
The 24-ounce guideline is an average, not a rigid target. Your baby might consistently drink 20 ounces or 28 ounces and be perfectly fine. The more reliable indicators are steady weight gain along their growth curve, six or more wet diapers a day, and consistent energy levels. If your baby suddenly drops well below 16 ounces of formula without a matching increase in solids, or if weight gain stalls, that’s worth bringing up with your pediatrician.
Babies receiving at least 32 ounces of formula daily get enough vitamin D from the formula itself. Since most 9-month-olds drink less than that, your pediatrician may recommend a vitamin D supplement, particularly if your baby isn’t eating many vitamin D-rich foods yet.