A lot of women do have healthy babies when over 40 and women in their 20s can have a disabled child - it's a risk that only you can decide on. I had 2 daughters a year apart in age when I was in my early 20s and from a very early age they just didn't get on by the time they were teenagers they seemed to positively dislike each other and now in their early 40s they hardly have anything to do with each other there is no anymosity there now they just lead ther own very seperate lives. I am sure if asked they would both say that they would have preferred to be an only child and significantly they each have had only one baby. Whereas some of my friends with 2 or 3 children have found them to be best of friends. So there are no guarantees in life and no right or wrong answers to your problem. Hope my ramblings have been of some help and haven't confused you even further but I wish you good luck whatever your decsion