Baby Nutrition Supplement Guide: How to Supplement Vitamin D, Calcium, Iron, and DHA

Vitamin D

Why supplement: Breast milk is extremely low in vitamin D, yet babies need it to promote calcium absorption.

• Start at 2 weeks after birth, 400 IU daily
• Continue until age 2; after that, decide based on the situation
• Choose a pure vitamin D3 drop; no need for combined A-D preparation

Calcium

Need to supplement? Babies who drink milk normally usually don’t need extra calcium.

• 0–6 months: calcium in breast milk or formula is sufficient
• 6–12 months: over 600 ml of milk plus calcium from complementary foods
• 1–3 years: 300–500 ml of milk daily, paired with soy products and leafy greens

Iron

Why supplement: After 6 months, the iron reserves babies got from the mother are depleted and must come from complementary foods.

• Choose iron-fortified rice cereal as the first complementary food
• Eat more red meat puree, animal liver puree (1–2 times per week)
• Pair with vitamin C foods to boost iron absorption (tomatoes, oranges, etc.)

DHA

Role: promotes brain and retinal development.

• Breastfeeding moms should supplement DHA themselves
• Formula usually already contains added DHA
• During complementary feeding, eat deep-sea fish: salmon, cod

Principle of supplementation: food first, supplement only if deficient. Don’t blindly take multiple nutrients; it’s best under a doctor’s guidance.