There are some readers who would read on this question. Maybe someone will come along who is willing to help you with this.
The trouble is, it's hard to say what exact cards would tell you this, though. I think you'd need to decide for yourself what cards would indicate children, their genders, etc. Then you could try readings to answer that kind of question. No single card that I know of would indicate something like that, but that's because I've never taken the time to look through my decks to "program" that sort of thing into a deck. By "program", I mean deciding ahead of time which cards would indicate which gender, which color hair, etc.
"Beginning today, treat everyone you meet as if they were going to be dead by midnight. Extend to them all the care, kindness and understanding you can muster, and do it with no thought of any reward. Your life will never be the same again." ~ Og Mandino