http://www.slate.com/articles/life/family/2015/10/we_need_a_new_etiquette_for_the_handwritten_thank_you_note.html

There are two major occasions on which a grown-up receives piles and piles of presents: a wedding and the birth of a first baby. Unlike wedding gifts, which bestow on two adults nicer versions of household items they already own, baby gifts are actually necessary. Infants may not require as much stuff as the Baby Industrial Complex (“Big Baby”?) wants us to believe, but they do have needs: diapers, cribs, tiny items of clothing, oddly shaped pillows, mini nail clippers, breast-milk bags, and beyond.