This has been a trend for awhile, but I still find it kind of appalling. In "Gender Reveal" parties, the results of a woman's pre-natal sonnogram are sent to a baker. The baker makes a cake with either pink or blue custard or food dye in the cake batter. The expecting parents invite over their friends and family, cut in the cake, and voila - the baby's sex is revealed.
It's not just the public nature of the revelation and the lack of focus on simply hoping for a healthy baby (as someone who had several late miscarriages, I would worry about tempting fate) but also the focus on the pink or blue. The infant hasn't been born, and now we are going to have a party to start building on our preconceptions about just how different that child will be, depending on that x or y chromosome. Because baby boys will be aggressive and curious, and baby girls will be sweet and delicate, and blah blah with the socially-created and then fulfilled expectations.
Clearly feeling a bit cranky this morning. Anyway, here's a video of such an event.