I've seen this idea around, in various forms, but I thought I'd simplify it as much as possible to make it a nice easy (not super quick) do.
Pretty basic- part the hair into two sections as if you were going to do pigtails. Then separate that into 3 sections- doing a very simple braid on each section.
Once you have three sections, braid those all together, and rubber band. (remove the other 3 rubber bands)
Repeat on the other side.
Cute little braided braids!