Start an "I Can" can. Ask your child to decorate an old coffee can with stickers, construction paper, and crayons. Every time your child masters a new skill, write it on a slip of paper and put it in the can. Check on the contents of the can from time to time, so your child can see how much he's or she's learned.
[Source: Raise Your Child's Self-Esteem! 99 Easy Things to Do]