Just to let you know I am not fishing for compliments or anything. Thought I was probably not the only member out there who had a little one they might want to kilt up early who could appreciate a positive review of a budget priced but functional option.
Good looking boy. He looks a little thin waisted like my son. Might I suggest just a small safety pin to function as a kilt pin. It's just a smaller verion of a real standard one and works well with the wee kilts. Sporrans are a little trickier, but you can fins small ones as SWK and even smaller ones at Celtic Croft. Either way, you will have to cut some chain out of it to make it work.

My son loves his kilt as well. He wears a navy blue onesie to go with it. Sometimes makes me wish they had onesies in menn's sizes