My Ob told me the "dangerous " period was when the births were less than 18 months apart, there is lots of info out there, you really need to research vbacs well, to be able to understand them, I had a csec 18 mths ago, am trying for a vbac in a few months, lots of statistics out there, uterine ruptures are actually VERY rare, so look into it, and do whats best for you!!!!!