often considered the british spelling, US spelling is actually more correct, “fetus” correctly derives from the Latin fetus see alternate spelling fetal period above.

of or relating to a fetus; "fetal development"

Having to do with the foetus.

Of or pertaining to a foetus. The unborn young of an animal while still in the uterus

Of or belonging to the foetus, or embryo in course of development.

In a lateral position with knees drawn and arms folded.