Most babies stop drinking formula at 12 months old. That’s the age recommended by the CDC and the American Academy of Pediatrics for switching from infant formula to whole cow’s milk or a fortified alternative. The transition doesn’t need to happen overnight, and there are a few things worth knowing about how to do it smoothly.
Why 12 Months Is the Cutoff
By their first birthday, babies can and should get most of their nutrition from solid foods. Formula is designed to be a complete nutrition source for infants who can’t yet eat enough variety, but once a child is eating meals with proteins, grains, fruits, and vegetables, formula stops being necessary. Whole cow’s milk fills the remaining gap for fat and calcium without the cost or complexity of formula.
Stopping formula before 12 months is a different story. Cow’s milk given to babies under one can cause tiny bleeds in the digestive tract, a condition known as intestinal micro-bleeding. Cow’s milk also has protein and fat ratios that don’t match what a young infant needs, which can strain developing kidneys. Formula or breast milk should remain the primary drink for the entire first year.
How to Make the Switch
You don’t have to swap every bottle on your child’s birthday. The CDC suggests starting by replacing one formula feeding with cow’s milk and gradually working through the rest over a week or two. If your baby resists the taste, Children’s Hospital of Philadelphia recommends mixing equal parts whole milk and prepared formula, then slowly increasing the milk ratio until you’ve phased formula out entirely. One important note: don’t mix powdered formula with whole milk instead of water. Always prepare formula with water first, then combine.
Use plain, unsweetened, pasteurized whole cow’s milk. Reduced-fat or skim milk doesn’t provide enough fat for brain development at this age. Most pediatricians recommend sticking with whole milk until age two.
How Much Milk a Toddler Needs
Once your child is drinking cow’s milk, keep it to about 16 to 24 ounces per day. Too much milk can crowd out solid foods, and excess cow’s milk consumption has been linked to iron deficiency in toddlers. Milk is meant to complement meals at this stage, not replace them. If your child is eating well at breakfast, lunch, and dinner, a cup of milk with meals and one at snack time is typically plenty.
Skip Toddler Formulas
Walk down any formula aisle and you’ll see products labeled for toddlers aged 12 months and up. These are marketed as a nutritional step up from regular milk, but medical organizations disagree. A 2023 AAP report found that toddler milks are unnecessary for healthy children, and some are actually worse than cow’s milk. Unlike infant formulas, which are strictly regulated by the FDA, toddler formulas face no such oversight. They aren’t required to prove any of their nutritional claims.
Some toddler formulas contain too much or too little protein, and many include added sweeteners that can build a preference for sugary drinks early in life. Harvard Health Publishing summarized the AAP’s position bluntly: not only are these products unnecessary, they can be unhealthy. Plain whole milk or fortified soy milk is a better choice for most toddlers.
What If Your Baby Has a Milk Allergy
Babies with cow’s milk protein allergy are a special case. During the first year, these children typically drink extensively hydrolyzed or amino acid-based formulas that break milk proteins down enough to avoid a reaction. When it’s time to transition at 12 months, cow’s milk obviously isn’t the default option.
Your child’s doctor will guide the switch based on whether the allergy has been outgrown (many children do outgrow it by age one or two) or whether you need to move to a fortified plant-based milk like soy. Goat milk is not a safe substitute for babies with cow’s milk protein allergy, as the proteins are similar enough to trigger the same reaction. The timeline for stopping specialty formula may extend beyond 12 months depending on how well your child tolerates solid foods and alternative milks.
Signs Your Baby Is Ready
The 12-month guideline assumes your baby has been progressing normally with solid foods for several months already. Most babies start complementary foods around 6 months, when they can hold their head up, sit with support, show interest in what you’re eating, and swallow food rather than pushing it back out with their tongue. By 12 months, a baby who has been eating a growing variety of solids is well positioned to leave formula behind.
If your child was born prematurely or has developmental delays that have slowed the introduction of solids, the timeline for dropping formula may look different. In those cases, the transition is based more on your child’s individual feeding skills than on the calendar.