i have a 5year old daughter who Is perfectly healthy in every way. but i have had 2 children aswell who both had a lethal form of skeletal dysplasia. after the first time with it. i was told it would never happen again it is so rare and if it did it would be a girl. unfortunately it did happen again, this time a little boy. i have since been told i can't have anymore children due to this. is this true? and could ivf help me to have a healthy baby?