### [Baby Nutrition Supplement Guide: How to Supplement Vitamin D, Calcium, Iron, and DHA](https://www.mamihelp.com/en/article/2632)

**Published:** 2026-08-23T04:56:57

**Author:** 妈咪助手

**Excerpt:** A clear guide on supplementing babies with vitamin D, c…

## 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.

**📌 Key Takeaways：**When and how to supplement your baby with vitamin D, calcium, iron, and DHA, plus why a food-first approach works best.

  

### 📖 Related Reading

-   [Which Nutrients Does Your Baby Need?](https://admin.mamihelp.com/2562/.html)
-   [Which Nutrients Does Your Baby Need?](https://admin.mamihelp.com/2701/.html)

**Categories:** 营养百科_en

**Comments:** 

**Which Nutrients Does Your Baby Need? – 妈咪助手 – 母婴育儿知识与好物推荐平台:** \[…\] Baby Nutrition Supplement Guide: How to Supplement Vitamin D, Calcium, Iron, and DHA \[…\]



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