T.Q.
Kristy,
The Original Little Sprout has a great line of kids' hair products.
http://www.originalsprout.com/
I've been using them on my son since he was 8 months old. They are a bit pricey, but the gel lasts a long time. They also have a mousse and balm that are nice. I use the balm in my own hair.
After reading these other suggestions, I think I'll try something else since they all seem cheaper. :)
Good luck!
-T.