Ha ha... Mom of three here and the super glue was funny!
As a mom I like snaps, but I don't know how well they work with hand knitted items, they may do well.
I would NOT use velco on anything I knitted. I'd be afraid that it would catch on the knitting.
Zippers are good too.
If you want to do buttons you would add button holes... I know that I've seen how to add the loopy ones that are at the edge of the piece....