Trisomy 18 and Trisomy 15

At age 39 and 18 weeks pregnant, my child was diagnosed as having Trisomy 18.  She was still born on 7/30/04.  I got pregnant again and miscarried, she was diagnosed as having Trisomy 15.  Other than because of AMA, should I be concerned?  Is there any other possible reasons?  Should I forget having a healthy baby on my on?  I currently have a perfectly healthy 4 year old.  How uncommon is it to have to children back-to-back with those Trisomy Abnormalities?  

Thanks for any advice and help you can give.

Sincerely,
Nonni40

[Christie2004]

The best person to ask this question of is your doctor.

  Trisomies are more common with advancing maternal age, but I simply don't know whether these two events are linked, or are plain tragic coincidence.

Certainly, it would not be unwise to consult a genetic counselor if your doctor thinks it would be helpful in deciding whether to try again.  

I'm so sorry for your losses.