What is infant formula?

Written by Yuppo Lab Experts.

Updated 27 October 2026

Infant formula is a manufactured milk, usually based on cows' milk, designed to meet a baby's nutritional needs when they are not breastfed or are fed breast milk and formula. A standard first infant formula is suitable for the whole of the first year.

Key takeaways

  • Babies do not need follow-on or "growing-up" milks.
  • Never make homemade formula or dilute formula more than instructed.
  • Cows' milk as a main drink is not suitable before 12 months.

What you can do

  • Follow the instructions on the pack exactly when measuring powder and water.
  • Prepare feeds with clean equipment and use them within the recommended time.
  • Feed responsively: watch for hunger and fullness cues rather than finishing every bottle.

When to talk to your doctor

Talk to your doctor before switching to a special formula, such as for reflux or allergy, and seek advice if your baby has blood in their poo, vomits a lot or is not gaining weight.

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