S.M.
Hi S., I have two tips if you'd like them? :)
1) Put the gate higher. LOL My children are both very tall, (I am fairly tall and my husband's 6'5"), so we had to start doing that early.
2) Take away the nap or shorten it, (or just shag his little butt out in any way possible)! I know that will stink but I had to do the same with my daughter and, knock on wood, it's helped. She also has a playmate now, I watch my friend's boys, so she's more active which is good... another person for her to run after!
Hope this helps!
S.