monozygotic twins in uterus with single placenta, 3d . human embryos at the age of 8 weeks

twins two embryo fetus monozygotic 3d baby human pregnancy week illustration medical development pregnant womb uterus fetal anatomy month accurate child unborn inside amniotic foetus 8 abortion embryonic body newborn biology growth gynecology infant sonogram science life placenta female medicine closeup reproduction conception macro birth common single chorion amnion period