Fetal Weight
Select pregnancy week
20 weeks
48121620
242832364042
Normal Fetal Weight
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—
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Approx. length
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Week 4
0%
Week 40
—
Normal range (g)
—
week
—
trimester
🫐
Baby is about the size of:
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—
—
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Weekly Fetal Growth Chart
| Week | Normal Weight | Length | Size comparison |
|---|
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About this Tool
What is a normal fetal weight?
The fetus develops significantly throughout pregnancy weeks, from a few milligrams in early weeks to 3.5–4 kg at birth around week 40.
Is my baby's weight normal?
This tool shows WHO reference averages. A weight is considered normal if it falls within the given range. Slight variations are perfectly normal.
Factors affecting fetal weight
- Genetics and parents' height
- Mother's nutrition and overall health
- Pregnancy number (second baby often heavier)
- Baby's gender (boys slightly heavier on average)
⚠️ This tool is for awareness only. Monitor fetal growth through your doctor and ultrasound scans.
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