If you happen to live in Denver and have a family, you're in luck, because you have a terrific kid portraitist nearby. Cheryl Jacobs Nicolai is a commercial portraitist whose website is divided into "Short People," "Tall People," and "Eyes." A nice list of categories/priorities.
It's quite possible that we have an especial appreciation for photographers who are particularly good at the types of work we ourselves have done, but, professional admiration aside, I think it should be obvious to anyone that Cheryl has a real feel for kids. A visit to her website is a virtual lesson in "How It Oughta Be Done." If that's not enough for you, she teaches workshops, too.
So what if you don't live in Denver? You can pay her to travel, but here's a tip—if three clients hire her from any non-Denver location, she'll travel for free.