Nutrition Guides

Baby Nutrition Guides: Iron, Calcium, Vitamin D and More

Understand the key nutrients your baby needs from 4 to 12 months. Our nutrition guides cover iron, calcium, vitamin D, omega-3, zinc, and protein with the best food sources.

8 free guidesUpdated 2026AAP & CDC reviewed

11 mg/dayIron RDA (7–12 months)

400 IU/dayVitamin D RDA (infants)

260 mg/dayCalcium RDA (7–12 months)

100 mg/dayDHA recommendation

About This Section

Good nutrition in the first year of life lays the foundation for lifelong health. Your baby needs a carefully balanced range of nutrients to support explosive brain development, rapid bone growth, immune system maturation, and healthy body weight. Our nutrition guides break down each key nutrient, what it does, how much your baby needs, the best food sources, and warning signs of deficiency.

Why the First Year is Critical

The first 1,000 days of life (conception to age 2) represent the most critical window for nutritional investment. Deficiencies during this period can have lasting effects on brain development, immune function, and long-term health outcomes.

Nutrients Most Often Deficient in Infants

Iron is the most commonly deficient nutrient in infants, followed by vitamin D, zinc, and omega-3 fatty acids. Breast milk is nutritionally complete for most needs but requires supplementation for iron (after 6 months), vitamin D (from birth for breastfed babies), and fluoride.

Food vs. Supplement

Where possible, nutrients from whole foods are preferred. However, vitamin D supplementation is universally recommended for breastfed babies. Always check with your pediatrician before starting any supplement.

Pro Tips

Serve vitamin-C rich foods alongside iron-rich foods to boost iron absorption.
Full-fat dairy (yogurt, cheese) is ideal for babies, they need dietary fat for brain development.
Fortified foods (iron cereal, DHA formula) can help fill nutritional gaps.
Always check with your pediatrician before starting any supplement.
Zinc is often overlooked, good sources include meat, legumes, and whole grain cereals.

Featured Guides

Our most popular guides in this section.

A bowl of plain whole-milk yogurt with soft steamed broccoli on a baby's feeding tray

Featured

Calcium for Babies: Best Foods for Strong Bones and TeethCalcium builds your baby's bones and teeth during the fastest growth period of their life. See the best calcium-rich foods for babies by age, with easy serving ideas.Read guide →

A bowl of oatmeal with mashed pear and a few soft cooked peas on a baby tray

Fiber for Babies: Digestion, Constipation, and Best FoodsFiber supports healthy digestion and can ease constipation in babies. Learn how much fiber babies need and the best fiber-rich first foods to offer.Read guide →

Small portions of lentils, meat puree, and fortified cereal

Iron-Rich Foods for Babies: Why Iron Matters and Best SourcesIron is critical for baby brain development from 6 months. Discover the best iron-rich foods for babies, how much iron they need, and tips to maximize absorption at every meal.Read guide →

Browse by Age Group

Find guides specific to your baby's current developmental stage.

0–6 Months

All nutrition from breast milk or formula. Supplement vitamin D if breastfed.

6–8 Months

Start iron-rich first foods. Continue breast milk or formula.

9–12 Months

Varied diet with all food groups. Vitamin D supplement continues.

All Nutrition Guides Guides

8 free guides, reviewed against AAP and CDC guidelines, updated 2026.

Flaked cooked salmon and mashed avocado on a baby's feeding plate

Omega-3 for Babies: Brain-Boosting Fats and Best Food SourcesOmega-3 fats, especially DHA, support your baby's brain and eye development. Learn the best omega-3 foods for babies and how to serve them safely.Read guide →

Soft shredded chicken, mashed lentils, and cubed tofu arranged on a baby's plate

Protein for Babies: How Much They Need and Best First FoodsProtein fuels your baby's rapid growth and development. Learn how much babies need at 6–12 months and the best protein-rich first foods to offer safely.Read guide →

Mashed orange sweet potato, soft carrot, and butternut squash on a baby plate

Vitamin A for Babies: Vision, Immunity, and Best FoodsVitamin A supports your baby's vision, immune system, and growth. Learn how much babies need and the best vitamin-A-rich first foods to offer safely.Read guide →

A flaked piece of cooked salmon and a halved soft-boiled egg on a baby plate

Vitamin D for Babies: Why Supplements Matter and Best SourcesThe AAP recommends vitamin D supplements for all breastfed babies from birth. Learn why vitamin D is essential, how much to give, food sources, and supplement safety.Read guide →

Soft shredded chicken with mashed lentils and a bowl of oatmeal on a baby tray

Zinc for Babies: Why It Matters and Best Food SourcesZinc supports your baby's growth, immune system, and development. Learn why zinc becomes important around 6 months and the best zinc-rich foods to offer.Read guide →

Expert Guidelines We Follow

All content in this section is reviewed against these authoritative sources.

AAP on Vitamin D

The AAP recommends all breastfed and partially breastfed infants receive 400 IU of vitamin D per day starting within the first few days of life.

AAP on Iron

Full-term breastfed babies should receive 1 mg/kg/day of supplemental iron from 4 months until iron-rich complementary foods are introduced. Formula provides adequate iron through fortification.

AAP on Omega-3

DHA plays a critical role in brain and eye development. The AAP supports DHA-fortified infant formulas and encourages consumption of low-mercury fish.

AAP and CDC Guidelines

All content reviewed against American Academy of Pediatrics and CDC infant-feeding recommendations.

Updated 2026

We review and update guides whenever infant feeding recommendations change so you always get current advice.

Always Free

Every guide in this section is completely free. No paywalls, no sign-ups, no subscriptions required.

Frequently Asked Questions

Quick answers to common questions about nutrition guides.

How can I make sure my baby gets enough iron?

Offer iron-rich foods at every meal from 6 months. Best sources include pureed meats (beef, chicken), iron-fortified baby cereals, pureed lentils, beans, and tofu. Pairing iron-rich foods with vitamin C enhances absorption.

Does my breastfed baby need vitamin D supplements?

Yes. The AAP recommends 400 IU of vitamin D drops daily for all breastfed babies from the first days of life, because breast milk does not provide adequate vitamin D on its own.

What foods are high in calcium for babies?

For babies under 12 months, the main calcium source is breast milk or infant formula. Once solids begin, calcium-rich foods include full-fat yogurt, soft cheese, tofu, and soft-cooked broccoli.

Can my baby eat fish?

Yes, low-mercury fish like salmon, cod, tilapia, and trout can be introduced around 6 months. Fish provides DHA (omega-3), protein, and zinc. Avoid high-mercury fish like shark, swordfish, and king mackerel.

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