Babies can stop drinking formula at 12 months old. At that point, you can switch to plain whole cow’s milk as part of a balanced diet that includes solid foods. This is the standard recommendation from both the CDC and the American Academy of Pediatrics, and it applies to most healthy, full-term children.
Why 12 Months Is the Cutoff
The 12-month mark isn’t arbitrary. Before that age, a baby’s kidneys are too immature to handle the high concentrations of protein and minerals in cow’s milk. Cow’s milk also lacks adequate iron, vitamin C, and other nutrients that infants need during their first year. Perhaps most concerning, the proteins in cow’s milk can irritate a young baby’s stomach and intestinal lining, leading to small amounts of blood loss that, over time, can cause iron-deficiency anemia.
By 12 months, your child’s digestive system and kidneys have matured enough to process cow’s milk without these risks. Their diet has also shifted significantly toward solid foods, so milk becomes a supplement to meals rather than the primary source of nutrition.
How to Make the Switch
You don’t need to swap formula for milk overnight. A gradual transition over a week or two works best and gives your child time to adjust to the taste difference. There are two common approaches.
The first is mixing formula and milk in the same bottle. Start with mostly formula and a small amount of milk, something like 3 ounces of formula to 1 ounce of milk in a 4-ounce bottle. If your child drinks it without fuss, increase the milk ratio over the next several days until the bottle is all milk. One important detail: prepare the formula as you normally would first, then add the milk. Don’t mix cow’s milk directly with formula powder.
The second approach is replacing feedings one at a time. Offer a 2- to 4-ounce serving of milk in place of one formula feeding, while keeping the rest as formula. Over the next week or so, swap out more formula feedings for milk until the transition is complete.
Either method works. Choose whichever fits your routine. Once your child is drinking milk comfortably with no digestive issues, you can stop formula entirely.
What Type of Milk to Use
Whole milk is the go-to choice for children between 12 months and 2 years old. Toddlers need the higher fat content for brain development and energy, which is why vitamin D-fortified whole milk is recommended over reduced-fat varieties at this age. Choose plain, unsweetened, pasteurized milk.
If your child has a cow’s milk allergy or your family avoids dairy, fortified dairy alternatives can work, but not all plant-based milks are nutritionally equivalent. Look for one that’s unsweetened, unflavored, and fortified with both vitamin D and calcium. Nutrient content varies widely between brands and types, so check labels carefully. Most rice milks, for example, are too low in protein and fat to serve as a primary milk source for a toddler.
How Much Milk a Toddler Needs
Once your child is on whole milk, aim for about 16 to 24 ounces per day. Going over that amount consistently can backfire. Too much milk fills a toddler up and crowds out solid foods, which are now the main source of iron and other key nutrients. Ironically, the same iron-deficiency anemia that cow’s milk causes in young infants can also develop in toddlers who drink too much of it, because it displaces iron-rich foods from their diet.
Skip the Toddler Formula
Walk down the formula aisle and you’ll see “stage 3” or “toddler formula” products marketed for children 12 months and older. The AAP is clear on these: most toddlers don’t need them. These drinks are generally unnecessary, offer no nutritional advantage over cow’s milk for most children over 12 months, and are often high in added sugar. They’re also significantly more expensive than a gallon of whole milk.
Adding to the concern, there’s currently no U.S. regulatory oversight ensuring that toddler formulas meet any uniform nutritional standards, unlike infant formula, which is tightly regulated. The marketing around these products can make parents feel like they’re necessary, but for a healthy toddler eating a varied diet, plain whole milk does the job.
The exception is children with specific medical conditions, allergies, or feeding difficulties that make it hard to get adequate nutrition from food and milk alone. In those cases, a specialized formula may genuinely help, but that’s a conversation to have with your pediatrician rather than a decision driven by packaging claims.