Its all really dependent on genetics it depends on the genes in the parent fish. Albinism(a) is recessive, while normal non-albino(A) is a dominate trait. Using a punnett square is a fairly accurate way to determine what the offspring will be when crossing different traits like aa, Aa, AA. However its not that easy in nature like aquariangel pointed out. There are various ablino traits, the most common we see in livebearers is albino eyes with the fish still retaining pigment in its scales. This is a common trait in livebearers, but usually less common than pure albinism in most organisms. Even in other fish, albino pelcos, corys, rainbow shark, they always show fully albinism. I once came across some pics of fully albino livebearers and they were really shocking. I'll have to see if I can find them. Thing is genes are linked and its quite complex, a different gene being dominant or recessive may effect how another gene is expressed.
As for the baby fish, theres really know why to know ATM. Wait till they grow up, my best bet is that they will change colors. Fry tend to be kinda transparent normally, especially if light colored.