Well in the beginning it's a Blastocyst but I think you are looking for Embryo.
Cygnets.
An unborn baby is referred to as a fetus, or foetus.
an Orthodox
Unborn Baby.
Embryo or Egg.
feetus
A fetus is another name for an unborn baby, and growth is how it gets bigger.
Oxygen
fetus
Sharon Tate's unborn baby boy (who died with her) was posthumously named Paul Richard Polanski. She didn't have a daughter.
you are able to give them any name when they are born. My sister could give her child my last name if she wanted, or her best friends last name.
Flangarhmoohgarden Diocide. Which translates loosely to "swine unborn".