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yt:quality=high anatomy animated antepartum haemorrhage baby breech position c-section cesarean delivery childbirth diagram drawing fetal fetus fetus in utero function of placenta gynaecology gynecology labour low lying placenta marginal placenta previa medical obgyn obstetric complications obstetrics partial placenta previa placenta praevia placenta previa reproductive pathology second tri total placenta previa types ultrasound diagnostic uterus women's health