DEAR ERIC: I’m a 42-year-old woman who is child-free by choice. I always remember birthdays, and love giving thoughtfully chosen gifts to the people in my life (my nearest and dearest, especially). But let’s be honest, we aren’t always close with everyone we’re related to, and at a certain point it gets to be a bit much. Everyone, it seems, is having kids, except for me. My husband and I are desperately trying to save for a house and I’m struggling with the feeling of inequity and imbalance around this never-ending custom of baby gifts. And truthfully, I feel a little bitter about i t. (Most o…