The average weight for a 4 month old boy is 14.25 pounds (6.6 kg) and the average weight for a 4 month girl is 13.25 pounds. These figures are from the Center for Disease Control and prevention, a group that's commonly known as the CDC. The CDC is a US federal agency that's part of the Department of Health.
Below is a summary of the height and weight of boys and girls that are four months old. The charts below are provided by the CDC.
Average Weight of a 4 Month Old Baby:
Below is a summary of the height and weight of boys and girls that are four months old. The charts below are provided by the CDC.
Average Weight of a 4 Month Old Baby:
- Average weight of 4 month old baby boy is about 14.25 pounds or 6.6 kgs
- Average weight of 4 month old baby girl is about 13.25 pounds or around 6.1 kgs
Average Length of a 4 Month Old Baby:
- Average length for a 4 month old baby boy is about 25 inches or 64 cm.
- Average length for a 4 month old baby girl is 24.25 inches or 60.3 cm.
With your new found knowledge about the average weight of a 4 month old baby maybe you want to tack on an understanding of baby sizes just below and just above this young age:
- average weight of a 5 month old baby (coming soon)
- average weight of a 3 month old baby
Height Weight Chart for Baby Girls

Height Weight Chart for Baby Boys
