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4-Month-Old Baby (16 Weeks)

One of the major developments you can expect during month 4 of your baby's life includes rolling over from the back to the tummy. Also, your 16-week-old baby may be starting to become more inquisitive about "grown-up toys," such as remotes, calculators, and telephones. Make sure that the things your baby decides to play with cannot be swallowed or choked on, or cause any other kind of harm.

You and Your Baby at 4 Months

As you are probably experiencing, a 4-month-old baby can be a lot of fun to be around. Giggles and coos have taken over as your little one's mode of communication has expanded beyond a few types of cries. And if your infant had colic, it has likely passed by now and your household has quieted down a little.
Your 4-month-old baby's weight has risen yet again with no plateau in sight. A 4-month-old baby boy, on average, will weigh just over 15 pounds, and the average baby girl will weigh about 13 1/2 pounds.

Major Developments for a 4-Month-Old Infant

Rolling over from the tummy to the back is usually accomplished first as it is easier to push up on the arms and topple over in one direction or another. This infant developmental milestone is usually achieved just before an infant is 3 months old. Regular "tummy time" will help build up the upper body strength needed to do those push-ups.
Rolling over from the back onto the tummy is physically harder to do. It requires significantly more strength and coordination to accomplish. At some point during month 4, the back-to-tummy roll is usually achieved.
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