Does having a baby = divorce?

My dear friend (who is happily married with two kids) sent me this sage advice:

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To: Me
Subject: MOST IMPORTANT ADVICE

Do NOT file for divorce during the baby's first year, even if you want to badly. It will pass. I'm actually serious about this.

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And shortly after that email I received this from another friend:

Eek! Should I schedule my appearance now for Ricki Lake's "Becoming a baby mamma ruined my marriage!"?