Babies 12 months of age and younger get the vitamin C they need from breast milk, while children ages 1 to 3 need 15 milligrams and children ages 4 to 8 need 25 milligrams, according to Mayo Clinic. Children ages 9 to 13 need 45 milligrams daily.
Adolescents from ages 14 to 18 require slightly more vitamin C, notes Mayo Clinic, with boys requiring 75 milligrams and girls requiring 65 milligrams. The tolerable upper intake limits from all sources of vitamin C range from 400 milligrams daily for children ages 1 to 3 to 1,800 milligrams for adolescents. Most children can meet their vitamin C requirements nutritionally without supplementation.