When baby cries, is it the mother's instinct or the noise that wakes her?

United States
June 13, 2008 7:51am CST
I have a six month old and I wake whenever she cries, while my husband can sleep right through it. Sometimes it seems she isn't even crying that loud. So I was wondering what you all thought, because I'm scared that sometimes I don't wake up and don't even know it.
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