How long have your kid call you"mam"or "father"after he be birthed?

@wzsj0501 (157)
China
June 22, 2009 7:18am CST
8 months?10months?I think the girl is fast in learning speaking than boy.my niece could call "mam" when she is 6 months old.but a boy should use 12 months!what about your kids?
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