May is beautiful here in the Midwest. After a long winter its gentle warmth, budding flowers and lengthening daylight are all welcome gifts. However, the madhouse end-of-school-year itinerary that accompanies it is not.

Having two sons of her own changed how this mom, who grew up with one sister, felt about boys. "But it struck me on the way home from a fishing trip there's still one thing I definitely don't have in common with boys — and that's what they take as a compliment."

Experts said several factors may be combining to drive the declines, including shifting attitudes about motherhood and changing immigration patterns.

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