Q. I am 38 weeks pregnant but ultrasound suggests growth of 36 weeks. Will it affect the baby?

Answered by
Dr. Sameer Kumar
and medically reviewed by Dr. Vinodhini. J
This is a premium question & answer published on Feb 20, 2020

Hello doctor,

I am 38 weeks pregnant (38 weeks and 2 days). I took an ultrasound today.

My report shows:

Biparietal diameter 8.93 cm (36w 1d)

Head circumference 32.17 cm (36w 2d)

Abdominal circumference 31.65 cm (35w 4d)

Femoral length 6.98 cm (35w 6d)

Average age of gestation based on today's scan: 36 weeks

Estimated fetal weight: 2765 grams.

I just want to ask if I need to be worried, as my doctor said the baby is small. Is there any problem for the baby because I am on 38 weeks 2 days now, but base on my ultrasound the baby is 36 weeks.



Welcome to

The growth of the child is two weeks smaller for 38 weeks but corresponding to its ultrasound age, the weight of the baby is fine. There is a likelihood that you may have had an irregularity in your menses earlier and your ovulation may have been delayed and leading to late conception. However, best would be to undertake a biophysical profile and an umbilical artery doppler, MCA Doppler studies (middle cerebral artery) to look for cause for decreased supply to the fetus (if at all).

If these parameters are normal, then your dates are probably wrong or you have had delayed ovulation and fertilization because fetus would then be considered growing and pregnancy can be continued and followed up with serial ultrasounds.

But nevertheless, even if dates are not good, still it is advisable that one should go with your dates as at 38 weeks and deliver the child by 41 weeks, considering the child has matured and the average fetal weight is also good.

I hope this helps.

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