6. Warm the formula, if needed

It's fine to give your baby room temperature or even cold formula. If your baby prefers warm formula, place a filled bottle in a bowl of warm water or run under warm water.

Test the temperature by putting a couple of drops on the back of your hand or wrist. The formula should feel lukewarm — not hot.

Don't warm bottles in the microwave. The formula might heat unevenly, making hot spots that could burn your baby's mouth.