13 weeks pregnant mother

Question: hi.. my BPD is 18mm in NT scan at 12.4 weeks...is it ok???

1 Answers
Answer: The diameter between the 2 sides of the head. This is measured after 13 weeks. It increases from about 2.4 cm at 13 weeks to about 9.5 cm at term. Different babies of the same weight can have different head size.