Congratulations! I've made lots of baby quilts also, but never got to make them for my own kids. So I made a twin size for my 5 year old and am finishing the top today for my 3 year old (also twin size).
Sometimes I find it helpful to choose my fabrics first and let them speak to me of the pattern they are to become.
However it works for you, good luck! And get lots of sleep now!! :wink: