My husband and I were debating this and I haven't been able to find any good statistics to back up either of us.

OK, so if you have fraternal twins, what are the chances of getting boy/girl twins? He says 50%, based on pure probability. But what about all the complex factors that go into gender selection? I mean, say you DTD 3 days before ovulation and happened to have a high dairy diet- studies have shown you're more likely to have a girl, and if so, wouldn't you then be more likely to have two girls if you're carrying twins? And vice versa for boys? If conditions in the mother's body, timing, and the dad's sperm count all contribute to what gender you get, it seems like you'd have a less than 50% chance of getting a mix, because conditions would favor one gender or the other.

Anecdotally, it seems like I know a lot more b/b and g/g twins than b/g.

Or is my husband right, and it's pure probability?

(I am just asking out of curiosity, because a friend of ours just found out she's having twins and we were chatting about it. )

OK, so if you have fraternal twins, what are the chances of getting boy/girl twins? He says 50%, based on pure probability. But what about all the complex factors that go into gender selection? I mean, say you DTD 3 days before ovulation and happened to have a high dairy diet- studies have shown you're more likely to have a girl, and if so, wouldn't you then be more likely to have two girls if you're carrying twins? And vice versa for boys? If conditions in the mother's body, timing, and the dad's sperm count all contribute to what gender you get, it seems like you'd have a less than 50% chance of getting a mix, because conditions would favor one gender or the other.

Anecdotally, it seems like I know a lot more b/b and g/g twins than b/g.

Or is my husband right, and it's pure probability?

(I am just asking out of curiosity, because a friend of ours just found out she's having twins and we were chatting about it. )

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