KOG-book has two child paddles.

1. Paddle for kog#55. 147 * 6,5 cm
loom: 22mm thickness, breadth 36mm. Totally non-shouldered.

2. Paddle for kog#47. 98 * 6 cm
loom: 32mm thickness, breadth 17mm. Non-shouldered, loom is about 10cm wide, blade topsides are about 20cm apart (I mean the each shoulder is about 5cm wide).

Kog#47 is said to be for a 5-6 years old. My estimation would be about 20kg child. I would say #55 is for slightly smaller kid. The paddles are very different, the first being a bit weird as it's loom width is greater that the thickness. But a child might be happy with such paddle - each part of the paddle will have similar grip. If I remember correctly, Sea Flea has quite much volume for a small child. So I would keep some length in the paddle so he/she can actually paddle.

: Anyone have advice on sizing a Greenland paddle for kids to use? I'd like to
: make a paddle for my 6 yo and 4 yo to use with a Sea Flea that I am
: making. I'm not sure if I use boat width, height and arm span, or just
: make a rough guess what will work best for them. I'm thinking 15-16 inches
: for the width of the loom, but I'm not sure about overall paddle length
: and blade width. The 6 yo is a bit under 48 inches and her sister a few
: inches shorter. The Sea Flea will be 19 inches wide. I'm also wondering if
: I might be able to use 1x4 cedar instead of 2x4 because the loom diameter
: will need to be much smaller. Any thoughts?