Congenital malformations are anatomical abnormalities present at birth. Approximately 3% of newborns have major malformations. Teratology studies abnormal embryo development and birth defects
Corpus luteum cysts are normal post-ovulatory structures in ovaries. Typically appear as 1-3 cm cysts with thick crenulated vascularized walls. Found in second half of menstrual cycle and first trimester of pregnancy
Full-term pregnancy is 39 weeks, not just 37 weeks. Preterm is before 37 weeks, early term 37-38 weeks. Late term is 41 weeks, postterm starts at 42 weeks. Twin pregnancies can be delivered at 38 weeks
Baby weighs 1-2 pounds and measures 1-2.5 inches. Main symptoms include back pain, pelvic pressure, and frequent urination. Baby's lungs mature and reflexes become more coordinated. Baby's position should be head down by week 36