I don't find those much more convincing. Mostly they say the negative effect comes from missing out on physical activity (in older children). For babies, I am

I don't find those much more convincing. Mostly they say the negative effect comes from missing out on physical activity (in older children). For babies, I am not sure what to think. Who watches 1 hour of movies with their baby? Were they really able to disentangle that from all other factors (socioeconomic status and so on)?