Is there a norm for when a pillow should be introduced????
I think they say after 12 months is fine, but I didnt feel comfortable giving Aidyn one until he was 2...

RE sleeping bags... Aidyn is still in his Grobag, but during the hot summer months he just sleeps in a t-shirt style pajamas... no blankets or bag or aything. Mind you its boiling hot here in Qld summer.
You can get really light tog sleeping bags (such as 0.5) which are good for summer.
I'd wonder about givin them a sleeping bag whilst in a bed though, because they can get out of bed I would worry about them tripping and falling over. Whilst Aidyn is still in the cot he is fine, and can usually stand with it on, but when he moves to a big bed he will not be having a sleeping bag.