Yeah, babies do smile when they want to, not when nosey DM readers want them to.
*My kids NEVER smile when we go through airports, or do something which requires my attention. They would look like the most serious kids in the world if someone was snapping pictures of us. But when we are at parks, or they have my attention, they do smile a lot. I would all kids are the same way.
My middle boy was a miserable grump from the day he was born and three years later, he is still grumpy. The boy rarely smiled. Not saying that Harper is grumpy; she may be a serious kid. She's as cute as anything, as are her brothers. As for Brooklyn looking annoyed, he's 14. I thought a sneer or a frown was the normal teenage boy look.