9 months

From Readers' Digest (http://www.rd.com)

After the birth of my son, a woman from the records department stopped by my hospital room to get information for his birth certificate. "Father's date of birth?" she asked. When I told her, she said, "Do you realize that his birthday is exactly nine months before your son's birth?"

"No, I hadn't thought about it," I responded, "but now that you mention it, I have a daughter who turned two a couple days before the same date."

After she finished taking down all the data, she patted my hand and said, "Maybe you should start buying your husband a tie for his birthday."

-- M.K. Pigott