Every time I see a 3-5 year old in a stroller on the subway staring at a phone their parent passed them, or worse, has dedicated to the child's entertainment (stroller mount included), my heart breaks a little more - though when my own preschooler won't stay in his seat and insists on standing while the train's in motion (his balance is really good, but oh, the looks I get), I'm a little tempted.