Other factors, such as pregnancy and illnesses, are also important.The best way to get the daily requirement of essential vitamins, including vitamin C, is to eat a balanced diet that contains a variety of foods.Dietary Reference Intakes for vitamin C:Infants0 - 6 months: 40* milligrams/day (mg/day)7 - 12 months: 50* mg/day*Adequate Intake (AI)Children1 - 3 years: 15 mg/day4 - 8 years: 25 mg/day9