1.   Amniocentesis is sometimes used later in pregnancy to determine fetal lung maturity in high-risk cases.

2.   But her lawyers argued that the boy was dead before she put him in the bag, saying he suffered from a fetal lung infection.

3.   Fetal lungs secrete liquid that makes up the amniotic fluid, along with urine.

4.   This receptor is normally present in fetal lungs, helping them to mature.