They take a picture with radio waves so can actually see the baby- an ultrasound. Doctors see so many they can tell sex even though low quality images.
Baby
A baby inside the womb is called a fetus.
Yes, it's a known fact buttressed by numerous photos that depict this behavior clearly.
In the uterus
The mother is then pregnant. Its called a foetus.
a baby crocodile squeaks inside its egg calling for its mother.
Crocodilians (baby crocodiles) squeak from inside their eggs to call their mother.
9 months
the placenta is taken out of the mother after delivery of her baby
Outside the mother, and inside an egg.
9 months
an umbilicus cord is a cord which babies have inside a mother to provide nutrients to a baby when it is inside a mother