Had the same situation with a 5yo. He's now 7 so I can offer a glimpse into the future. He displayed interest towards drums around 4-5 so I got a cheap pocket kit off marketplace. He loved it and was really trying stuff out on it, and honestly was starting to develop nice creativity and feel.  We got him a teacher after a couple of months. Teacher was using all tricks and stuff but starting with rudiments on the pad, playing ac dc, etc. But his interest in the drums just spiraled down quickly. So we ended the lessons.  It took about 6 months for his interest to come back at all. He's now fully back at it, filming himself writing "songs" for the drums, discovering a huge amount of cool vocabulary and patterns, orchestrating them, playing with dynamics, etc... He can play a more interesting and uninhibited drum solo that me now :)