Parents can get oddly competitive about their kids, and they have some backhanded compliments to dole out to parents they're intimidated by. They say it's not productive to compare your kid to others, but it's hard not to. If all the other babies are walking but your kid is still crawling, you might worry that they're behind. Other babies start talking very early on, while others don't speak in full sentences until they're two or three years old. It's understandable why parents would be concern…