Well, I had two 12 months and 5 days apart and the first was a preemie so not even due at the time he came. He was due the end of January and was born the first week of Dec. and the second one born December 5 days later than the first child's birthday. So that was fairly close and I did fine. I went on to have 6 more kids, total of 8, some were 14 months apart, and I am still in pretty good shape. Of course it could be hard on you but I believe keeping up with the kids all the years kept me feeling better physically. I know many who have prolapse, etc. and didn't have kids or even close together, etc. Everyone isn't the same though. Our son and his wife had one 14 months old when their twins were born. They survived fine and had another one even.