Baby Size & Growth Calculator
Estimate baby's size, weight and development milestones throughout pregnancy weeks
About this calculator
The Baby Size & Growth Calculator helps expectant parents track their baby's development throughout pregnancy by providing estimated size, weight, and key developmental milestones for each week. This tool uses medically-established growth patterns to give you insight into your baby's progress, from tiny embryo to full-term infant. Understanding these developmental stages helps parents prepare for their baby's arrival and provides reassurance about normal growth patterns during pregnancy.
How to use
Simply enter your current pregnancy week or expected due date into the calculator. The tool will instantly display your baby's estimated size (length and weight), developmental milestones for that week, and comparisons to familiar objects like fruits or vegetables to help visualize your baby's current size.
Frequently asked questions
How accurate are the baby size estimates?
Estimates are based on average medical data and may vary by 10-15% from your actual baby's size, as each baby grows at their own pace.
When do major developmental milestones occur?
Key milestones include heartbeat detection (6-8 weeks), organ formation (8-12 weeks), and viability outside the womb (22-24 weeks).
Can this calculator predict my baby's birth weight?
While it provides estimates, actual birth weight depends on genetics, maternal health, and other factors that vary significantly between pregnancies.