Babies sex

[netibiza]

I heard on TV the other night (can't remember the prog) that all babies in the womb, are, for the first 8weeks female and then some of them change to male?  Is this true??

[shoegal-nyc]

yep

[magicdice]

yes, that's why men have nipples.

the y-chromosome only kicks once development has started properly.

for some reptiles, the sex of their offspring depends on the temp of the eggs over the first few weeks

[Clanad]

Actually, A women's egg cells and a man's sperm cells each contain 23 single chromosomes, which are not paired until they meet their opposite number. Of the 23 single chromosomes, one is always a sex chromosome. Each egg always has an X (female) sex chromosome, but the sex chromosome present in any sperm can be either X (female) or Y (male). Hence, the sex of the baby is dependent on which type of sperm cell fertilizes the egg. The sex of the baby is determined at conception...