Found this website featuring a 4-year-old:
http://www.made-by-rae.com/2011/10/t...ewing-machine/
I have ordered from this website before, and they were good. It's easiest to look up your machine first, then search for a finger guard attachment that fits your machine:
https://www.sewingpartsonline.com/?g...xoCJy0QAvD_BwE