That's the conclusion of a study of more than 31,000 births, which showed that women aged 23 to 32 had the lowest risk of birth defects. Giving birth as a teenager or early twenty-something raised the chance of the child being born with defects to the central nervous system hampering brain and spine development, while mature pregnancies were associated most closely with deformities from birth of the head, neck, eyes, and ears.
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