Before birth1 min read
Fetal weight by week: reference ranges and red flags
How ultrasound estimates fetal weight, what affects it, and when to ask your clinician — Medlatec, ACOG aligned.
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Bầu Ăn Gì? Team · References Medlatec, ACOG
Why track fetal weight?
Estimated fetal weight on ultrasound helps check growth against gestational age. It is not exact but useful on a growth chart.
Factors involved
- Gestational age accuracy, singleton vs twins.
- Genetics, maternal nutrition, diabetes, hypertension.
Ask your clinician if
- Weight <10th or >90th percentile on your unit's chart.
- Slowing growth across repeated scans.
- Reduced fetal movement.
Nutrition support
Adequate protein, iron, and folate; avoid extreme dieting or rapid gain without medical advice.