Answer:
I have a daughter with Downs and I have been told it is VERY PROBABLE...ask your pediatrician
There is research on that subject. It can be found in scholarly journals. The ones that I have read say that is is very possible and usually likely that a person with Downs will have a child that does not have Downs. Even two people with Downs are more likely to have a child with out it. Downs girls do get pregnant as easily as those without Downs. Downs teens feel all the same stuff the other teens do. Hormones, pleasure, ovulation. Their just not as equipped to control the baser instincts. That and not to mention the ugliness of molestations or sexual abuse - not all Downs kids are able to communicate effectively enough to tell when something bad is going on. There is also alot of debate about sterilizing Downs girls. Birth control is difficult or impossible to administer to those with profound Downs. Lots of really hard issues. My boyfriend has a Downs girl-13. She has had her period since she was 10. She still cannot change her own pad, and will leave bloody pads in my son's bathroom sink. It's pretty gross stuff for a 10 yr old and 13 yr old boy. Heck it's incredibly gross to me and I've had 4 kids!