How much juice should your baby, your toddler, and your teen be drinking? Experts say less is more.

INFANTS. You shouldn't give your baby any juice for the first six months. Stick to breast milk or formula, which is much more nutritious, advises the American Academy of Pediatrics. After six months, if your little one is drinking from a cup, you can introduce some juice into his or her diet. Don’t give juice in a bottle, and never put your baby to bed with a bottle of juice—the sugar can lead to cavities. Four to six ounces a day is plenty. Or get your child to chow down on mashed-up or puréed whole fruits and vegetables.

TODDLERS AND SMALL CHILDREN. Fruit juice is sweet, and many kids will overindulge if given the chance. Don't give your tot a sippy cup full of juice, or a juice box, to walk around with all day. The prolonged exposure to sugar can cause dental problems. Instead, offer a cup of juice as a treat or a snack.

TEENAGERS. It can be hard to get a teenager to do anything you want, and drinking too much juice probably isn't a major worry. But at least one study has argued for a link between drinking more than 12 ounces of juice a day and obesity, though other research has indicated otherwise. One hundred percent juice is certainly better than soda, but try to encourage your kids to eat whole fruits instead and to limit juice to about 12 ounces a day.

Read more on ways to keep your child at a healthy weight.