My son is 16 and ever since he was old enough to talk, I told him the truth about any question he asked but I phrased it in a way that made sense to a child his age. I would ask first, does he understand that mommies carry babies in their stomaches? If he says yes, then I would say, well, some mommies decide that they can't or won't carry those babies for some reason or other so the baby is taken out with the help of a doctor. Most of the time when they do that, the baby is too little to live on its own yet and they call it an abortion. They do it for many reasons and sometimes the reasons are very complicated. I had two miscarriages before my son was born and I told him that those two little babies weren't strong enough to grow big enough to be born so the doctor had to help me take them out early and they died. But he was a very strong boy and got to stay until he was big enough to come out.