you must first get baby Vegeta by fusing (baby) and (vegeta second form) in evolution z and then you must use (baby vegeta) and (lower class sayian) but you cant go straight to the fusion first you...
When the Male tadpole travels into the girl and meets the egg it then forms a baby
You make love
Ask your parents or a baby if form by love if u do sex and men have a thing that goes to a women's egg to form a baby
Baby are fored Inside ur mothet