This is the genetics: ) e+ d" m3 r+ y! h; p: h6 a * f3 v( y9 J) S* k( aXY(man) x XX(woman) = ! c% X0 z4 c$ m. R7 MXX or XY, XX or XX, XY or XY. Some people have a twin. 5 b1 }5 z8 U& V9 w+ \5 ^' n9 [- q; c8 B0 R$ }
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.! D6 m! \* }" V) B! a* K
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Becareful, eating drug may cause mutation although the possibility is not so high.