Does anyone know where to find birth probabilities?

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Does anyone know where to find information on birth rates or probabilities by age of mother and father? I have found the National Vital Statistics web site to be helpful, but it's not exactly what I need.

What I'm trying to do is determine the probability that an individual has a child within x years. Similar to a mortality table.

For example, what is the probability that a female age 6, has a child in the next 10 years?