Health Library
Growth: 1 to 3 Months

What Are Growth Expectations for Babies 1 to 3 Months Old?

While all babies grow at individual rates, the following indicates the average for boys and girls 1 to 3 months of age.

  • Weight: average gain of about 1½ to 2 pounds each month
  • Height: average growth of over 1 inch each month
  • Head size: average growth of about ½ inch each month

Your Baby's Abilities

As your baby begins to grow, you will notice new and exciting abilities that develop. Babies at this age begin to relax the tight muscle tone of newborns and begin extending their arms and legs more.

While babies may progress at different rates, the following are some of the common milestones your baby may reach in this age group:

  • Most reflexes begin to disappear
  • Neck muscles become stronger, head bobs then is held erect
  • Turns head from side to side when placed on stomach
  • Brings hands or objects to mouth
  • Looks at hands
  • Follows light, faces, objects
  • Listens to sounds
  • Opens and closes hands
  • Holds, then drops a rattle or other object
  • Active leg movements
  • At the end of 3 months:
    • Raises head and chest when placed on stomach 
    • Beginning to reach hands to objects, may bat at hanging object with hands

Your Baby's Communication

It is very exciting for parents to watch their babies become social beings who can interact with others.

While every baby develops speech at their own rate, the following are some of the common milestones in this age group:

  • Coos, makes vowel sounds
  • Cries become more purposeful and are different for hunger, fatigue, etc.

Your Baby's Understanding and Awareness

A baby's understanding and awareness of the world around them increase during this time.

While babies may progress at different rates, the following are some of the common milestones in this age group:

  • Knows familiar voices, especially of mother and father
  • Smiles in response to others
  • Responds to social contact, may coo
  • Moves arms, legs, body in rhythm with other's voice

Development and Emotional Security

Young babies need the safety of caregivers' arms, and they understand the reassurance and comfort of your voice, tone and emotions.

  • Hold your baby face to face and make eye contact.
  • Talk to your baby with a soothing voice.
  • Give your baby rattles and soft toys with different sounds.
  • Let your baby hear different sounds (i.e., wind chime, ticking clock, soft music, music box).
  • Show your baby bright pictures of black and white images.
  • Hang a mobile with bright objects above your baby.
  • Call your baby by name.
  • Hold your baby during feedings and provide comfort when he / she is distressed. 

Last Updated 11/2021

Reviewed By Nick DeBlasio, MD

Visiting Cincinnati Childrens.

Cincinnati Children’s has primary care services at locations throughout Greater Cincinnati.