I have to agree with Pam and Lewanda.
After I upgrade to .05 version I noticed I started having problems having babies. Another thing I noticed was that later (on .04) when the baby was 2, 3 at the most, the parents could start having babies again. After I uploaded to .05 the time for them to start trying depends on the time I turn on the game after the birth - explaining:
Chloe got pregnant last night. I fed them, took care of the house and went to bed. When I came back today, the baby (Piccolo) was already 4 and they were saying it was too soon to have a baby. So I left the game and only when he was 5 (!) they agreed to try for a baby again (with no success until now).
Before Piccolo, they had Lolla - I was playing when she was "released" (*laughs*) from her mother's lap. As I was playing when it happened, they started trying again when she was still 2, almost 3 years old.
I think that if I stay a whole day off and turn on the computer with a 7 year-old last child, they will only try again when the child is 8!
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"Things won are done; joy's soul lies in the doing."
William Shakespeare