I think it depends on what the picture or video is. Obviously don't post things of them in the tub, or while potty training, etc. I know some pictures of your little child can be cute while they're in the tub, but stuff like that can go in the family album, or what have you.
People just need to remember that the internet is a public place. Grandma Sue isn't the only one that's going to see little Timmy standing up in the tub with only a bubble beard covering him. Anyone can see it, including your friendly neighborhood stalker, pedophiles, etc.