Congratulations on the baby!
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Scubachick67:Thanks again for the info guys. Prepare yourselves for a girlie plumbing lesson!
The uterus is an airspace. The baby is covered in a sac filled with amnio fluis inside the uterus. This sac grows with the baby and will eventually fill the uterus, but in the begining there is air in there. The placenta doesnt start to function until week 11 or 12, which means that the baby hasn't fully implanted until then. This is partly why the first three months are high risk.
I'd be more concerned for your wife!mrfish87:No ill effects on the kids except for the mask and fins they were born with....just kidding.