>>4
The baby is formed during pregnancy by a complex process of cell division. The blastocyst begins by forming the initial cells of the 100s of organs, muscles, arteries, major veins and major arteries, these cells then divide as programmed by millions of years of evolution into the embryo which grows into a baby.
>>5
Gravity works as it is an observable property which can be described by mathematics to a degree of accuracy that normal sensory input cannot perceive.