What should a man expect when he's expecting? To loosen his belt. About half of all expectant dads gain weight—up to 30 pounds—during their partners' pregnancies.

And that isn't all. A dad-to-be can expect to be slammed by at least one other pregnancy symptom, like nausea, fatigue, food cravings, odor aversions, mood swings, sleep problems or bouts of bloat. Symptoms commonly strike in the first trimester, wane in the second and return with a vengeance in the third.

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