Alot of young horses won't develop any 'like' of treats for a while; I've had youngsters not like treats until they were well into their 3 yr. Old year. Honestly, I don't hand feed babies anyway until they have had all their ground work done and I know they will respect my space without a shadow of a doubt...those young years are crucial in making sure you develop the RIGHT habits and behaviors that you expect out of him. Just put a few tidbits in his food every night, and if he eats, it fine, if he don't that's fine too; eventually he will start trying it more and more and eventually you will figure out what he likes and doesn't. But don't rush it, especially because he is so little. They tend to get nippy when they are young, because they teeth alot, so I just don't encourage nipping, by not hand feeding until they are a little older and getting closer to being done teething.
"The ideal horseman has the courage of a lion, the patience of a saint, and the hands of a woman..."