I was pretty lazy after DS. Got my depo when he was 2 days, then never got another one. Just kind of told myself, I'll do it one day...
AF didn't return til he was 9 months & was around 6 - 7 weeks apart. After having AF 3 times & being scared each time, I decided I best get something more reliable. I finally got my next depo just after he turned 1. Due for the next one next week.

I do know alot of people who fell pg in the first 3 months even though they were exclusively BFing, so I'd be looking for a back up. JIC.