Gender Bender
Everyone is perfectly entitled to choose how to identify themselves in terms of gender, but it looks like this poster is a bit confused. This excited poster is looking forward to welcoming the new baby cooking in their sister’s oven, but they’re not asking the gender of the baby on the way.
Instead, they’re excited to find out whether they will be an Aunt or Uncle. Of course, the sex of the baby does not determine your own gender. You can choose one or none, but it’s up to you, not the baby.