My friend wants a small age gap so even though her baby is only a month old wants to start trying pretty soon. I have told her maybe to wait until her baby is 7 or 8 months which will give a 16/17 month gap and is quite likely first child will be walking which will make things easier. she thinks that will be too late to avoid jealousy but my ds is 17 months and i'm pretty sure he doesn't know how to be jealous!