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The National Institutes of Health (NIH) says postpartum depression may persist after the recommended timeline for screening, citing the American Academy of Pediatrics' guidance that doctors screen women for postpartum depression several times up to six months after birth.

The NIH examined data on 5,000 women from the Upstate KIDS study in New York and found that about 1 in 4 moms experienced high levels of depression up to three years after birth.

The other women reported low levels of depression throughout the three years.

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