Gynaecology & Obstetrics Most vulnerable period for teratogenicity during fetal development is A 1st and 2nd week post feilization B 3rd to 8th week post feilization C 10th to 12th week post feilization D 18th to 20th week post feilization 💡 Explanation Most vulnerable period for teratogenicity during fetal development is ✓ Correct Answer: B. 3rd to 8th week post feilization