12.5 months between my 2 boys. We wanted them close but having them this close was a shock. It took a year to conceive DS1 and then DS2 was a surprise very shortly after even though we weren't trying to conceive yet, just not preventing.
The boys adore each other and now that they are both walking and babbling it's great to see them together. It is very tough though when they both get upset or both want to be held and I've only got the one set of arms. I guess that can happen with any age gap though.