Dear pravin,sorry to reply so late,i was not in india for sometime,so couldnt share the best way for no of children prediction.
The best way which i use and mentioned earlier is by vedic astrology.
So if you are interested in that,u can check out the book-> " A Catechism Of Astrology" by Dr B.V.Raman,UBSPD publishers.
check pages 70-74 first,u will get ur answers and not to be mentioned,the whole book is helpful for some critical,yet imp predictions.
I could have written here about the theory,but it is too lengthy to write in a forum,so better check the book.

Whitey, you are having 2 children...

I know the sexes if you would like to know.

really ?? Wow.. .. wat r the sexes.. n is my wife gonna be hot ?? n around wat age am i going to marry..N do i already kno the girl that i am going to marry or not ??