When did you get baby fever after LO1? How long did you have it before you got pregnant again (or started trying)?

LO is almost 9 months and I'm not ready, but I feel it creeping in. As he starts trying to walk (!!) and cruising / crawling everywhere, he feels less like a baby and more like a toddler. Luckily he has a 4:30 AM wake-up call lately, so that keeps me grounded.