developing embryo
- wombFetal development organ
- gestationCarrying offspring in womb
- cellsBasic biological units
- dividingSeparating into parts
- placentaFetal nourishment organ
umbilical · heartbeat · ultrasound · trimester · growth · forming · tiny · fragile · nutrients · amniotic · sac · implantation · blastocyst · zygote · differentiation · organs · limbs · pregnancy