This is the genetics: 2 A1 h! T5 F& B' z( [, X5 l, z) M ! [* k. K9 U# E: j' \XY(man) x XX(woman) = , {. [! K" c. H2 RXX or XY, XX or XX, XY or XY. Some people have a twin. ( |1 `2 Q$ h/ F : [/ T$ s. o, h; Y0 `" bIf you really need a boy, you can ask a doctor to take your Y only and injiect into your wife's XX, then you will have boy only.: Y) }3 R, W& P, c+ k
3 D/ y0 z1 C) b2 K' d3 Z' P; b
Becareful, eating drug may cause mutation although the possibility is not so high.