Infant Nutrition Basics: What Newborns Actually Need (0-6 Months)

If you have a newborn at home, you are probably tracking everything. You’re logging ounces, counting wet diapers, and obsessing over sleep schedules.

But when it comes to infant nutrition, the advice can be overwhelming. Should you feed on demand? Is your baby getting enough? Do they need supplements?

The good news is that for the first six months, nutrition is actually the simplest part of parenting. Unlike toddlers who throw broccoli on the floor, newborns have a very straightforward menu.

Here is the no-nonsense guide to feeding your baby from birth to 6 months.

(This is Part 3 of our Nutrition Series. For the big picture, read our (Ultimate Guide to Baby Nutrition: Year One.)

Breastmilk vs. Formula: Fed is Best

Let’s cut through the noise: The best choice is the one that gets your baby fed and keeps you sane.

Breastmilk: It’s often called "liquid gold" because it changes composition to match your baby's immune needs. It digests quickly, meaning breastfed babies often eat more frequently.
Formula: Today’s FDA-regulated formulas are excellent. They are fortified with iron and Vitamin D, ensuring your baby gets exactly what the growth charts demand.

The Golden Rule: Don't stress about the "perfect" choice. Your baby needs love and calories, in that order.

Feeding Schedules: Clock vs. Cues

One of the biggest questions in infant nutrition is: "How often should I feed them?"

In the first few weeks, forget the clock. Feed on demand.

Hunger Cues: Crying is a late sign of hunger. Look for early signs like smacking lips, rooting (turning head to find the breast/bottle), or sucking on hands.
The "2-3 Hour" Guideline: Newborns have tiny stomachs (the size of a marble on day one!). They need to eat every 2–3 hours. If your newborn is sleeping longer than 4 hours, your pediatrician will likely tell you to wake them up to eat until they regain their birth weight.

The One Supplement You Likely Need: Vitamin D

If you are exclusively breastfeeding, there is one nutritional gap you must fill.

Breastmilk is perfect, but it lacks Vitamin D. Without it, babies can develop rickets (soft bones).

The Fix: The American Academy of Pediatrics recommends 400 IU of Vitamin D drops daily for breastfed infants.
Formula Fed? You likely don't need this, as formula is already fortified.

Growth Spurts: The "Cluster Feeding" Phase

Around 3 weeks, 6 weeks, and 3 months, your baby might suddenly act like they are starving, wanting to eat every hour.

This isn't a supply issue. It’s a growth spurt. They are "cluster feeding" to signal your body to produce more milk (or simply because they are growing rapidly). It is exhausting, but it usually only lasts a few days. Hang in there!

Hydration Myth: No Water!

We mentioned this in our <Month-by-Month Guide>, but it bears repeating: Do not give water to a baby under 6 months. Their kidneys aren't ready for it, and it can dilute the sodium in their blood, leading to seizures. Stick to milk or formula only.

When to Start Solids?

Around 4–6 months, you might see your baby eyeing your dinner. While some pediatricians give the green light at 4 months, the World Health Organization (WHO) recommends waiting until 6 months for optimal gut health.

Watch for the signs:

Sitting up unassisted.
Holding their head steady.
Losing the tongue-thrust reflex.

(Ready for the next step? Check out our review of the Best Baby Food Brands of 2026 to stock up before you start.)

Summary Checklist (0-6 Months)

Feed on demand (every 2-3 hours).
Give Vitamin D drops if breastfeeding.
No water, juice, or solids yet.
Monitor wet diapers (6+ heavy diapers a day means they are getting enough!).

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