A 15-month-old should get about 2 cups (16 ounces) of dairy per day, with most of that coming from whole cow’s milk. The Dietary Guidelines for Americans recommend 1⅔ to 2 cup equivalents of dairy daily for children aged 12 through 23 months, and that dairy total includes yogurt and cheese alongside liquid milk. So if your toddler eats cheese or yogurt during the day, the amount of milk they need to drink goes down accordingly.
Why Whole Milk, Not Reduced Fat
Children between one and two years old should drink whole milk rather than skim or 2%. The fat in whole milk supports brain development during a period of rapid growth. Although the American Academy of Pediatrics has noted that reduced-fat milk could be considered for toddlers at high risk of obesity or cardiovascular disease, research suggests early introduction of reduced-fat milk may actually increase obesity risk later on. For the vast majority of 15-month-olds, whole milk is the better choice.
Choose pasteurized whole milk that’s fortified with vitamin D. It should be plain and unsweetened, not flavored varieties like chocolate or strawberry milk, which add unnecessary sugar.
What “2 Cups of Dairy” Looks Like in a Day
You don’t need to serve all 16 ounces in one sitting. A sample day from HealthyChildren.org (the AAP’s parent-facing site) breaks it into small servings spread across meals and snacks: half a cup of whole milk at breakfast, half a cup at lunch, half a cup with an afternoon snack, and half a cup at dinner. That totals 2 cups across the whole day, with each serving small enough that it doesn’t crowd out solid food.
If your child also eats a serving of yogurt or a couple ounces of cheese, you can drop one of those milk servings. A half-cup of yogurt or about 1.5 ounces of cheese counts as roughly half a cup of dairy.
Why More Isn’t Better
Toddlers who drink too much milk face a real risk of iron deficiency anemia. Milk is low in iron, and when it fills a child up, they eat less iron-rich food like meat, beans, and fortified cereals. Large volumes of cow’s milk have also been linked to microscopic bleeding in the gut, which further depletes iron stores. Case reports in the medical literature describe 15-month-olds developing serious anemia and swelling after consuming more than 900 mL (about 30 ounces) of milk daily.
A good ceiling is roughly 24 ounces (3 cups) per day as an absolute maximum, including other dairy. But the sweet spot is closer to 16 ounces of milk plus a serving or two of other dairy foods. If your toddler wants to drink milk all day and shows little interest in solid meals, cutting back on milk is usually the fix, not something to worry about with their appetite.
Nutritional Targets Milk Helps Meet
At this age, your child needs about 700 mg of calcium and 600 IU of vitamin D each day. One cup of whole milk provides roughly 300 mg of calcium and about 120 IU of vitamin D (when fortified). Two cups gets you close to half the daily calcium target and a meaningful chunk of the vitamin D requirement, with the rest coming from foods like cheese, yogurt, fortified cereals, eggs, and fish.
If You’re Still Breastfeeding
Both the AAP and the World Health Organization support continued breastfeeding up to age 2 or beyond alongside solid foods. If your 15-month-old still nurses, breast milk counts toward their dairy intake. There’s no strict formula for how much cow’s milk to add, since breast milk volume is hard to measure. A practical approach: offer cow’s milk with meals if your child is interested, and let nursing sessions happen on their own schedule. You don’t need to replace breast milk with cow’s milk or vice versa.
Serve It in a Cup, Not a Bottle
By 15 months, your toddler should be fully off the bottle. The AAP recommends completing the transition from bottles to cups by 15 months at the latest, with 12 months as the ideal target. After 18 months, children tend to become more attached to the bottle and resist weaning. Open cups and straw cups both work. Bottles make it easy for toddlers to sip milk passively throughout the day, which is one of the main ways they end up drinking too much.
Plant-Based Milk Alternatives
If your child can’t have cow’s milk due to allergy or intolerance, fortified soy milk is the only plant-based alternative recommended in the Dietary Guidelines for Americans for this age group. It should be fortified with calcium and vitamin D, unsweetened, and unflavored. Other plant milks like almond, oat, and coconut are significantly lower in protein and fat than cow’s milk or soy milk, and they don’t meet a toddler’s nutritional needs as a primary milk source.