B.R.
I'm thinking it's naturally going to slow him up until it gets better, but in a week or so, it should be healed enough for him to get back to normal exploring. It's a little set-back, but not something to be too concerned over as he'll get back on track and still learn to walk and all the other things to do with growing up.
I can remember having a bad foot injury just before my sixth birthday. I was off of my feet for 12 weeks and had to re-learn to walk after being able to get up again. It was a frightening experience for me, and I didn't think I'd ever walk again for the first day or so, but once I got over being afraid, I was back to my normal running all over the place. He'll do the same thing before you know it with his hand.