As annoying as it made me, I liked knowing about baby gear. My wife liked me knowing about baby gear. And I found, to my surprise, that learning about baby gear was forcing me to learn about babies themselves — what they like, what they dislike, what ages they grow into and out of certain behaviors. As the due date approached, I felt more prepared and less hapless than many of the other expectant first-time dads I met in our birthing…