< Back to All Articles

Your Infant’s Size and Growth Timeline

September 5, 2018

All babies are unique and grow at their own pace. However, it’s always a good idea to be aware of a few baselines and benchmarks for size and growth. At each well-child check, your pediatrician should be providing you with growth charts for your child for weight, height and head circumference (you can find these charts here), but sometimes said charts can be confusing. To simplify the process, we’re going to break down the averages (50th percentile for each category) below. These averages are all based off of the World Health Organization’s standards, and as such, are divided by gender.

Baby Girl Growth Chart
Age Length Weight Head Circumference
1 month 21.1 inches 9.4 pounds 14.4 inches
2 months 22.4 inches 11.3 pounds 15 inches
4 months 24.4 inches 14 pounds 15.9 inches
6 months 25.8 inches 16.1 pounds 16.5 inches
9 months 27.6 inches 18.1 pounds 17.3 inches
12 months 29.1 inches 19.8 pounds 17.7 inches
Baby Boy Growth Chart
Age Length Weight Head Circumference
1 month 21.5 inches 9.9 pounds 14.6 inches
2 months 22.9 inches 12.3 pounds 15.4 inches
4 months 25.2 inches 15.4 pounds 16.3 inches
6 months 26.6 inches 17.6 pounds 17 inches
9 months 28.3 inches 19.8 pounds 17.7 inches
12 months 29.8 inches 21.2 pounds 18.1 inches

Remember that these numbers are just averages; the most important thing is that your baby is growing at a steady pace. And never be afraid to consult your pediatrician if you have any questions or concerns about your baby. Your pediatrician should always be your number one resource.


Author icon

Author Info

Avatar for Lauren Soderberg

Lauren Soderberg

Wife of one tall drink of water. Mama of two spunky kids. Lover of awkwardly long hashtags and unicorn emojis. And babies, obviously.

Product icon

Products in this Article

Comment Bubble icon


Leave a Reply

This site uses Akismet to reduce spam. Learn how your comment data is processed.