Often trisomy 13 is associated with older mothers. Even so, the risk of having another baby with trisomy 13 is usually very low -- unless, as with your son, the trisomy 13 is a translocation. A translocation is not associated with mom's age, but is a hereditary chromosome problem. The risk of recurrence in some types of (balanced) translocations can be quite high. The inheritance of trisomy 13 is very complex. By testing your blood and that of the baby's father, a geneticist can give you the best available information for your situation.
Dr. Alan Greene, author of Raising Baby Green and Feeding Baby Greene, is the founder of Dr.Greene.com and the WhiteOut Movement. He is a frequent guest on such shows as Good Morning America, The Today Show, and the Dr. Oz Show. He is on the Board of Directors of Healthy Child Healthy World and The Lunchbox Project. Dr. Greene is a practicing pediatrician at Stanford University's Packard Children's Hospital.
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