Fetus
noun, の adjective
A womb child is a child that's still in the womb, aka a fetus.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
エコーで胎児が足を伸ばしたり曲げたりするところが見れました。
I was able to see the fetus stretch and bend its legs on the ultrasound.
医師は両親に胎児の状態を詳しく説明した。
The doctor explained the condition of the fetus in detail to the parents.
胎児は順調に育っています。
The fetus is developing well.
胎児の心拍が確認された。
The fetus's heartbeat was detected.