Why do babies from older moms risk chromosomal abnormalities?

While older parents may be better equipped to handle some aspects of pregnancy and child-rearing (like some of the stresses and emotional wear and tear), and may be better able to support their children financially, there are some physiological trade-offs that you'll want to consider if you are making a decision about when to have children. Before ovulation, eggs have two copies of each of the 23 chromosomes. They're lined up waiting for the signal to split for the entire life of Mom.

Unfortunately, the little spindles that pull chromosomes apart don't work as well when they've been waiting to divide for four decades. Instead of a clean break, two copies can get pulled to one side and none to the other. And that's what leads to an increased risk of chromosomal abnormalities, such as Down syndrome, and an increase in miscarriages in older moms.

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