At 26 weeks of pregnancy, biparietal diameter is 54, femur length is 34. Is the baby small?

Patient's question:

I am 23 years old,
I am quite thin, and my current weight is 91 jin.
I only discovered I was pregnant half a month ago.
Now the baby is 26 weeks old. The ultrasound shows a biparietal diameter of 54mm, a femur length of 34mm, and an humerus length of 31mm.
Is the baby small? All other developmental indicators are normal. What impact will this have on the child?
Thank you all~~

Doctor's answer:

According to your ultrasound report, it is basically consistent with the gestational age, and all data are within the normal range. At 22 weeks of pregnancy: The average biparietal diameter is 5.45 ± 0.57; The normal value of the femur length is approximately 2-3 cm different from the corresponding gestational age biparietal diameter value, i.e., 55 - 34 = 21 mm = 2.1 cm. It is recommended that expectant mothers ensure a balanced intake of nutrition during pregnancy. If the balance is disrupted, it will be detrimental to the baby's development.

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