Most babies stop drinking formula at 12 months old. At that point, you can switch to plain whole cow’s milk or a fortified dairy alternative as part of a diet that increasingly centers on solid foods. This isn’t an arbitrary cutoff. By their first birthday, most babies have the digestive maturity and dietary variety to get their nutrition from regular food and milk rather than formula.
Why 12 Months Is the Standard
Around a baby’s first birthday, their kidneys and digestive system can handle the protein and mineral load in cow’s milk, which would be too much for a younger infant. At the same time, most 12-month-olds are eating a wide enough range of solid foods to fill the nutritional gaps that formula previously covered. Formula is designed to be a complete or near-complete source of nutrition, but by 12 months, that role shifts to table food, with milk serving as a supplement rather than the main event.
There’s no benefit to continuing standard infant formula past 12 months for a healthy child who’s eating well. The American Academy of Pediatrics recommends whole cow’s milk starting at 12 months as part of a balanced diet, and it costs significantly less than formula.
How to Make the Switch
You don’t have to go cold turkey. A gradual transition over one to two weeks works well and gives your baby time to adjust to the taste difference. There are a few approaches depending on how your baby responds.
If your baby takes to cow’s milk easily, start by replacing one formula feeding with a 2- to 4-ounce serving of whole milk. Over the next week or so, increase the number of milk servings while decreasing formula servings. Once they’re drinking milk without issues, you can stop formula entirely.
If your baby isn’t a fan of the taste, try mixing prepared formula with whole milk. Start with a ratio of about three parts formula to one part milk in a bottle, then gradually shift the balance toward more milk over several days. The key detail here: always prepare the formula with water first, then add milk. Don’t substitute milk for water when mixing powdered formula, as that changes the concentration of nutrients.
Children’s Hospital of Philadelphia notes that it’s fine to offer a small amount of whole milk, about an ounce in a sippy cup, once a day starting around 11 months to ease into the transition before the full switch at 12 months.
How Much Milk Your Toddler Needs
Once your child is on whole milk, the recommended range is 16 to 24 ounces per day. That upper limit matters. Toddlers who drink too much cow’s milk run into a few problems: the calcium in milk interferes with iron absorption, they fill up on milk and skip iron-rich foods at meals, and excessive milk intake can irritate the lining of the digestive tract, leading to small amounts of blood loss that further deplete iron stores. Iron-deficiency anemia in toddlers is frequently linked to overconsumption of cow’s milk.
Think of milk as one part of the diet, not a replacement for meals. Two to three cups a day alongside balanced meals is the sweet spot.
What About Toddler Formulas?
Walk down the formula aisle and you’ll see “stage 3” or “toddler” formulas marketed for children over 12 months. These are generally unnecessary. The AAP has stated that toddler formulas are “nutritionally incomplete” and offer “no benefit over much less expensive cow’s milk” for most children older than 12 months. Some are high in added sugar, and the marketing around them can make parents feel like they’re essential when they’re not.
For a healthy toddler eating a varied diet, whole cow’s milk does the job. Toddler formulas won’t cause harm, but they’re not an upgrade, and the cost difference adds up quickly.
Non-Dairy Alternatives
If your child can’t have cow’s milk due to an allergy, intolerance, or dietary preference, fortified dairy alternatives can work. The CDC identifies fortified soy milk as the closest nutritional match to cow’s milk for toddlers. Other plant-based milks (oat, almond, coconut) vary widely in protein and fat content, so checking labels is important.
Whatever you choose, look for versions that are unsweetened, unflavored, and fortified with both vitamin D and calcium. Nutrient content differs between brands, so this is worth a conversation with your child’s pediatrician to make sure the alternative you’re using actually meets your toddler’s needs. It’s also worth noting that plant-based milks don’t interfere with iron absorption the way cow’s milk does, which can be an advantage for children at risk of iron deficiency.
Water and Other Drinks After Formula
Once formula is out of the picture, your toddler’s fluid intake comes from whole milk, water, and the moisture in foods. Between 6 and 12 months, babies need only about 4 to 8 ounces of water per day on top of formula or breast milk. After 12 months, water becomes a more important part of daily hydration as milk intake is capped and solid food takes center stage.
Juice, flavored milks, and sweetened drinks aren’t necessary at this stage. Plain water and whole milk cover hydration and nutritional needs without introducing added sugars that can set up unhealthy patterns early on.