Care and Feeding Photo illustration by Slate. Photo by LSOphoto/iStock/Getty Images Plus.  Care and Feeding is Slate’s parenting advice column.  Have a question for Care and Feeding?  Submit it here . Dear Care and Feeding, My husband and I are thrilled to be expecting our first child in four months. However, my mother recently came to me with some unsolicited and, in my opinion, bizarre advice. She warned me not to let my husband watch our baby being born. The reason? She said it will ruin him sexually. She told me that she and my dad have not had sex in 31 years because he decided to watch my birth and “it rendered him impotent.” I told her she was crazy and not to bring up the subject again. Her response was that I would learn the hard way. The whole thing about men never having sex with their wives again after watching them give birth is just a stupid urban legend, isn’t it? —TMI, Mom!…