The Pocket-size Mason Pearson brushes are perfectly sized for children up to about age 10. Beyond that point, you may want to consider one of the larger models. Remember, your child may be using this brush for 20 years.
The Child model is a good choice for a 3 to 6 year old. We've also included the Handy and Pocket Nylon models as we've had a couple of reviews of the Handy Nylon that raved about it's detangling without tears. Some customers have told us the same about the Pocket Bristle & Nylon, so we've included that here too.