There is no "right" gap between kids. Whatever happens you make it work. There is 19 months between my boys (would have 20 if Tom wasn't early). I love it and they get along really well but it is definitely busy and there have been some tough times. Also don't forget to factor in being pg with a littlie - this is not easy in itself - even apart from m/s, do you remember first tri tiredness? So don't go into it thinking it will be a breeze, you will have moments, but then that's what parenting is all about. If it's what you want, go for it. There is nothing that warms my heart more than watching my boys playing together and lighting up at the sight of each other. It makes everything worth it.