When is the baby fully developed?

All major organs form by week 12. The baby is considered full-term from week 39–40. Lungs are among the last organs to fully mature, completing around week 36.

How accurate are fetal size estimates?

Ultrasound measurements have about ±15–20% margin of error for weight estimates in the third trimester. Length measurements are more accurate in early pregnancy.

What is the average birth weight?

The average birth weight at 40 weeks is 7.5 lbs (3.4 kg). Normal range is approximately 5.5–10 lbs (2.5–4.5 kg).

When is the baby fully developed?

All major organs form by week 12. Full-term is week 39–40. Lungs complete maturation around week 36.

How accurate are fetal size estimates?

Ultrasound weight estimates have ±15–20% margin in the third trimester. Length is more accurate in early pregnancy.

What is the average birth weight?

Average birth weight at 40 weeks is 7.5 lbs (3.4 kg). Normal range: 5.5–10 lbs (2.5–4.5 kg).

What trimester am I in?

First trimester: weeks 1–12. Second trimester: weeks 13–26. Third trimester: weeks 27–40.

How is fetal length measured?

Before 20 weeks, CRL (crown-rump length) is used. After 20 weeks, CHL (crown-heel length) measures head to foot. Ultrasound measures head circumference, abdominal circumference, and femur length to estimate size.