Is cocoa ok for a 6mo?

[KikiShack]

I was using up half a banana after making some nectarine puree (I've found adding a little banana helps make a smoother more pulpy puree instead of the almost unpleasantly bitty mixtures I get when I whizz up eg cherries, nectarine etc) and so as to give DD different flavours I added some pure 100% cocoa powder as well as some milk.
Separate to nectarines, just banana, milk, cocoa. It's in the freezer, then I just thought I'd check (pfb) there's no reason I can't give DD this is there? it's clearly not chocolate!! I'm being irrational. Just thought I'd check.
FYI the mixture is very tasty.

[Goingcrazy888]

It's fine at 6m. Hope she enjoys it, sounds yummy.