This is the genetics:* q& O7 F9 _5 Y( h1 e G: i
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XY(man) x XX(woman) = " p1 {( P% i' m/ [XX or XY, XX or XX, XY or XY. Some people have a twin. , F* H5 M! v4 s! }; u u
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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.; m$ D/ N! ]* F$ C ^% ~6 H0 C
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Becareful, eating drug may cause mutation although the possibility is not so high.