Amazing, that does make sense. My other chick Pebbles started returning the chest bumping a few weeks ago, I'm pretty certain she's a pullet too. They're the same age.
Well thank you so much you've been so helpful. :)
Thanks for your help!
I've been thinking River was a boy this whole time due to behaviour. But then looking at the photos on here the males seem to have definite comb development by this age (way earlier in fact).
Are the pullets quite feisty as well with this breed? Chest bumping other chick...