My son regularly eats more than my daughter at any given meal. He’s destined to be a linebacker. Two nights ago at dinner he was holding a handful of food in each hand and was drinking from his sipper-cup hands-free by biting down on the lip and tilting his head back. I was speechless.

My daughter is still learning her days of the week. She still doesn’t quite know what you mean if you say something like, “We’ll do that on Monday.” She knows that Monday isn’t today but she doesn’t know how far away that is. I asked her, “Did Mommy give you a bath this morning?” “Yes.” [...]