Usage patterns
〈胎児〉が育つfor a fetus to grow/develop
The fetus is developing normally inside the mother's womb.
〈胎児〉の心音を確認するto check the fetal heartbeat
The doctor checked the fetal heartbeat with an ultrasound scan.
〈胎児〉に影響を与えるto affect the fetus
Smoking during pregnancy has a bad effect on the fetus.