I just want to clarify something. There is no such thing as an easily reversible vasectomy. I believe what you all are referring to is the vas-clip. First of all, it is not as effective as a "traditional" vasectomy. So if you really don't want to be pg that's not your best option. Secondly, there are abolutely no guarantees--even with the vas clip--that it is reversible w/o surgery. Thirdly, even if a man did have it reversed. . .there is no guarantee that his fertility would return. (This is true of conventional vasectomies as well.) The vas clip is not widely available in the US, and is not covered by some insurance carriers (bc it is not as effective). Also, FYI, it is law in some places that you have to wait 30 days after the initial consultation before having the procedure done.
I agree other pp that with Kaylee so young, that is a rather hasty decision. You may not be ready for another one now but what about when Kaylee is 5 or 6? It is hard to think that far down the line. . .but in theory it's possible you could want another one in several years. . .or even a few years. No doubt, the first year of infanthood is intense. . .I imagine it would be more so with a child who has special needs. But it gets easier.
Have you thought about VCF? Or Plan B? (Although Plan B works like the pill-- so I'm sure if that would mess you up or not. . .I imagine it would depend on how much sex you have

Point is, you cannot undo a vasectomy easily, and even if you do, you cannot be assured that his fertility will return. Will there be harm in waiting a year or even two and seeing how you all feel when Kaylee is older and life is easier to manage? Just a thought.