Hi Rosie,
We just spent nearly 2 years int the Maldives -- our son was 6 months when we arrived from the US. We lived in Male', so I can only comment about the life there.
Overall, we enjoyed our time but I'm not sure if we would necessarily return. Maldivians are some of the nicest, most hospitable people I have met (and I have traveled a fair amount), especially if you're with a baby/kid. That was by far the best thing about living there. Sometimes they can get TOO friendly -- pinching our son's chubby cheeks -- but I found that gently moving their hand away and telling them that "he's shy" tends to fix that problem.... :-)
Otherwise, your quality of your life will depend on essentially two things 1) if you will be accompanied by spouse/partner/nanny/parent, anyone who can help you with child care. Don't count on finding a nanny in Male' -- it's very difficult, in fact nearly impossible, unless you bring one with you; 2) if your job will allow you (time and resources) to spend many weekend breaks at the resorts and/or Sri Lanka, i.e. if you can afford to get away from Male' on a regular basis.
I'll be perfectly honest -- without those two things I personally would not recommend anyone with kids to move to Male'.
The city is very crowded, traffic is terrible and it's very difficult to walk (little or no sidewalks, almost no parks) -- essentially, during the week, you will spend very little time outside. The flip side is that if you can afford to go to the resorts on the weekends, it really does make up for it. You basically live on the beach for 2-3 days! Sri Lanka is also wonderful.
We lived on the main island, but if we were to do it all over again, we would definitely live on Hulhumale or Vilingili. In addition to being less crowded, it has a proper beach, which means that your little one can go swimming every day! But note, if you don't know already, that in the inhabited islands women must wear full, non-revealing clothing for swimming -- essentially, long, baggy shorts and a rashguard or other shirt with sleeves. No bikinis or other swimwear. Of course at the resorts anything goes.
Healthcare is mainly ok for routine things, colds, high fever, etc.... Pediatricians are a hit-or-miss, but in the end we found a good one, although I imagine for anything major, you would want to go abroad. Thankfully we didn't have to deal with that.
Our son didn't attend pre-school but from what we heard there is essentially only one option, Kangaroo Kids, and then for primary, Bilabong School. I think both have websites but I wouldn't be able to comment on them.
In short, it really depends on what you'll be doing there, but you really need proper support and regular getaways to enjoy it. Also make sure to follow the news -- as you may know, the country is going through a bit of political turmoil at the moment, though it usually it doesn't affect foreigners that much.
Happy to answer any other questions you may have.
Dan