A 9-month-old typically needs about 24 to 32 ounces of breast milk or formula per day, spread across 3 to 5 feedings. That’s less than what your baby was drinking a few months ago, and that’s exactly the point. At this age, solid foods are stepping in to cover a growing share of your baby’s calories, and milk gradually shifts from the only source of nutrition to the primary one.
Daily Milk Amounts by Feeding Type
Stanford Medicine Children’s Health recommends 30 to 32 ounces of formula per day for babies 9 to 12 months old, broken into 3 to 5 feedings. UC Davis Health narrows the per-feeding range to about 6 to 7 ounces every 3 to 4 hours during the day, which works out to roughly 24 to 28 ounces across 4 feedings.
If you’re breastfeeding, measuring ounces isn’t realistic. Instead, most breastfed 9-month-olds nurse 3 to 5 times in 24 hours. Some still wake to feed at night, which counts toward that total. The length of each nursing session often shortens compared to earlier months because babies become more efficient and because they’re also eating food.
How Solids Change the Equation
At 9 months, solid food provides roughly one-third of your baby’s daily calories. That proportion keeps climbing until it passes the halfway mark around the first birthday. Milk still carries the majority of the nutritional load right now, which is why it stays the primary drink even as your baby gets better at eating table foods.
A practical way to think about it: offer milk first at meals if your baby seems very hungry, or offer solids first if they’re only mildly hungry. There’s no single correct order. What matters is that both are happening consistently throughout the day. If your baby fills up entirely on solids and starts refusing milk, the total daily volume can dip below what they need for adequate fat, protein, and calcium. On the flip side, a baby who drinks too much milk may lose interest in solids and miss out on iron and other nutrients that milk alone can’t fully provide at this age.
Why Cow’s Milk Should Wait
The American Academy of Pediatrics recommends sticking with breast milk or formula as your baby’s main drink until after their first birthday. Whole cow’s milk doesn’t have the right balance of iron, fat, and vitamins for an infant’s developing body, and it can irritate the lining of a young baby’s digestive tract.
That said, dairy foods like yogurt and cheese are fine to offer as part of solid meals starting around 6 months, as long as there’s no strong family history of cow’s milk allergy. The restriction is specifically about using cow’s milk as a drink that replaces breast milk or formula. Some pediatricians suggest trying a small amount of whole milk in a sippy cup, about an ounce a day, starting around 11 months to ease the transition. Before that, breast milk or formula plus water are the only drinks your baby needs.
Water at 9 Months
Between 6 and 12 months, the CDC recommends 4 to 8 ounces of water per day. That’s a small amount on purpose. Water is meant to complement milk, not compete with it. Offering a few sips from an open cup or sippy cup at mealtimes is enough. Too much water can fill a baby’s tiny stomach, crowd out milk and food, and in rare cases cause a dangerous drop in sodium levels.
Nutrients That May Need a Boost
Two nutrients deserve extra attention at 9 months. Vitamin D supplements of 400 IU per day are recommended for all babies under one year, regardless of whether they’re breastfed or formula-fed (though formula-fed babies who drink enough fortified formula may already meet this threshold). Iron is the other one. Breastfed babies in particular benefit from iron-rich solid foods like fortified cereals, pureed meats, and beans by this age, since breast milk alone doesn’t supply enough iron after 6 months.
How to Tell Your Baby Is Getting Enough
Counting ounces is one tool, but your baby gives you other signals too. At least 6 wet diapers per day, with no gap longer than 8 hours between them, is a reliable sign of adequate hydration. Weight gain at this age is slower than it was in the early months. By 6 months, many babies gain about 10 grams or less per day, which is noticeably less dramatic than the roughly 28 grams a day they were packing on as newborns. Steady, gradual growth on your baby’s own curve matters more than hitting a specific number.
Other reassuring signs include active, alert behavior between feedings, consistent interest in both milk and solids, and soft stools. If your baby seems constantly hungry, is losing weight, or has significantly fewer wet diapers than usual, those are worth bringing up at your next well-child visit or sooner.
A Sample Feeding Day
Every baby’s schedule looks different, but a rough framework for a 9-month-old might include:
- Morning: 6 to 7 ounces of milk, followed by or alongside a small breakfast of soft fruit and iron-fortified cereal
- Midday: 6 to 7 ounces of milk with a lunch of soft vegetables, small pieces of protein, or yogurt
- Afternoon: a smaller milk feeding or a snack of finger foods, depending on hunger cues
- Evening: 6 to 7 ounces of milk with dinner, then a final milk feeding before bed if needed
Some babies cluster their milk feedings earlier in the day and eat more solids in the evening, or the reverse. Following your baby’s hunger cues rather than a rigid clock tends to work best. The goal is a total somewhere in the range of 24 to 32 ounces of milk alongside 2 to 3 solid meals, with the balance tipping gradually toward more food over the next few months.