He had his very first go at sewing at Christmas, courtesy of a Mister Maker hand-puppet kit and it struck me the that 3 1/2 is an ideal age to start gathering together your very first bits and pieces for sewing.
After a quick sift through 8,000 candy-pink kits on the internet, I decided that it would be more fun, and probably cheaper, to put together my own customised sewing kit for him, tailored to his interests.
Behold - the sewing menagerie!
The yarn in his kit is from Poundland. Not the nicest quality acrylic, to be honest, but it's ideal for this purpose and you get 3 balls for £2. I re-wound a selection of colours into tiny balls and have also supplemented it since with a handful of brightly coloured Lion Brand Bonbons. (These are the world's cutest and tiniest sample-size yarn balls, discovered thanks to my highly enabling friend, Charlotte!)
The other thing I've added to his kit, thanks to a great suggestion from a friend, is a few sheets of plastic aida with large holes. You can leave them blank or draw shapes on these using a sharpie, for a child to sew along. At some point I might add some large-holed buttons too, so he can play with sewing those on. As for needles, you can get sets of children's plastic needles for around £1 on eBay or Amazon.
So far all of our bits and bobs are residing in a little cardboard box - but a lovely friend of ours has bought him this fab little animal-themed sewing box, which looks absolutely perfect!
So - if you know any tiny people that love to craft, I'd definitely recommend spending a happy afternoon putting together a little kit like this. Applique templates online can be a good source of ideas for simple shapes that will work in felt.