Cygnets.
feetus
An unborn baby is referred to as a fetus, or foetus.
Well in the beginning it's a Blastocyst but I think you are looking for Embryo.
an Orthodox
Unborn Baby.
Embryo or Egg.
The scientific,most recognizable name for it is called,foritsiden.
Louis B
A fetus is another name for an unborn baby, and growth is how it gets bigger.
Oxygen
fetus
The name given to the human organism two to eight weeks after fertilization is an embryo.