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Congenital Anomaly Scan mommy is best done during second trimester (18-22 weeks), tinitingnan dun kung nagdedevelop ba normally yung baby sa womb. While Biophysical scoring naman is mostly done kung kabuwanan mo na. Titingnan naman dun kung okay yung panubigan mo, fetal heart rate, position, at kung stress na ba si baby sa loob.