This is the genetics: 8 q$ t9 b; N( T3 j 9 i2 z: S+ Z# y. r. t+ s1 A5 cXY(man) x XX(woman) = 1 H7 A1 J+ Z: y& P8 V- b+ I/ DXX or XY, XX or XX, XY or XY. Some people have a twin. $ e' c4 l/ O v# c( J# \ {; y1 U& C; b0 e1 @( {1 `
If 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.& Z0 N6 k. K9 _! U, e: B5 \
- T7 z! |: S- ]* qBecareful, eating drug may cause mutation although the possibility is not so high.