When Your Baby Is Newborn To 4 Months Old From birth to 4 months, your baby:

• Sucks and swallows liquids.

• Pushes its tongue out.

• All babies need breast milk or baby formula with
  iron. Breast milk is best for your baby!

• Your baby will have a special cry or fussiness to
  show when he or she is hungry.

• Feed your baby when your baby is hungry.

• Do not try to feed your baby on a schedule.

• Your newborn might wake up hungry several times at
  night. Over a few months, most babies will start to
  sleep through the night.