depending on their stage of development, most of the same things that make up an adult human being only in smaller amounts.
magic
babies breath in and out the amniotic fluid inside the womb to practice breathing and that causes them to get the hick ups
babies ball up while in the womb because there is not much moving space and it then seems to be a bigger space if they are smaller.
When babies are in the womb they take up the fetalposition.
yes, babies sleep in the womb but that does not mean they are always sleeping
Most commonly, babies in the womb have there knees pulled up, there hands in each other.
Yes, babies can sense other babies in the womb through movements and sounds, but they do not have a full understanding of what is happening.
They don't.
Ultrasound.
Babies sleep at times in the womb and are awake at other times
IT IS SO COLD IN THE womb IT WAS SO WORM
Yes.