Can anyone skull theory my baby?

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Just for fun I did Dan test so I won't know gender for 10 days! 13w1d due 10/19/16❤️

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Skull theory?? Never heard of such a thing

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Here's a good comparison for skull theory

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Looks like a boy to me using nub theory :)  skull theory is a bit harder to guess :/

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Due October 19th too!!!  Not planning to find out sex until my bubble arrives but curious what skull theory is.

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I think boy 💙

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I'm thinking boy

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Here's another picture

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