All babies may grow at a different rate. But here is the average for boys and girls 1 to 3 months old:
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.
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 start extending their arms and legs more. Babies may progress at different rates. But here are some of the common milestones your baby may reach in this age group:
Some of the newborn protective reflexes start to disappear
Neck muscles become stronger, head bobs then is held erect
Turns head from side to side when placed on belly
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 belly
Starts to reach hands to objects, may bat at hanging object with hands
It's very exciting for parents to watch their babies become social beings who can interact with others. Every baby develops speech at their own rate. But these are some of the common milestones in this age group:
Starts to imitate some sounds (coos, vowel sounds)
Cries become more purposeful and are different for hunger, severe tiredness (fatigue), and other needs
A baby's understanding and awareness of the world around them increases during this time. Babies may progress at different rates. But these 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
Young babies need the security of a parent's arms, and they understand the reassurance and comfort of your voice, tone, and emotions. Here are some ways to foster your newborn's emotional security:
Hold your baby face to face and make eye contact.
Talk to your baby with a soothing, animated voice during the day while dressing, bathing, feeding, or playing with your baby.
Sing to your baby.
Give your baby rattles and soft toys with different sounds.
Let your baby hear different sounds (for example, wind chime, ticking clock, soft music, or 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 they are distressed and cuddling when happy.