Still parents are often eager to start their babies on solid food. The baby now measures about 4 3 to 4 6 inches and weighs about 3 5 ounces.

4 Months Old Baby Developmental Milestones

Babies at this age love to express themselves through smiles laughs gurgles and coos.

Baby at 4 months old. Follow the links below to read development information tailored to the specific week of your baby s life. Learn about the other milestones here. Many pediatricians still start babies on solids around 4 months of age.

For the first four to six months of life your baby gets all the nutrients he needs from breast milk or formula. You should be able to feel the top of your uterus about 3 inches below your belly button. Now that your baby is more active and alert during the day winding down in the evening can be more of a challenge.

Protect your baby against 14 vaccine preventable diseases before the age of 2 years old. Of course that doesn t mean your 4 month old should weigh and measure exactly that. This may mean two daytime naps morning and afternoon for three to four hours each and a longer stretch of sleep at night.

The average weight for a 4 month old baby is 14 2 pounds for girls and 15 4 pounds for boys. Though the typical 4 month old takes three or four naps each lasting around an hour or so each day some babies stick with five or six naps of about 20 minutes each and others do better on two long naps each lasting 1 or 2 hours. Your 4 month old is growing more and more alert by the day.

The average length aka height is 24 4 inches for girls and 25 2 inches for boys. The average 4 month old baby needs between 12 and 16 hours of sleep every day. At 4 months of age your baby shouldd receive these vaccines to develop immunity from potentially harmful diseases.

Smiling spontaneously is one of many developmental milestones that 4 month old babies reach. Babies 4 6 months the aap recommends that an infant not be started on solid foods until after 6 months of age.