I can't remember with DD1 but she had it before DD2 came along so younger than 15mths, i put it under the fitted sheet in her cot.
DD2 has had one since she was out of the bassinet as she seems to sleep better a little raised, same thing though it's under the fitted sheet.
Pip started with a pillow after about 18 months, we were finding that he'd be in our bed and using our pillows, and he'd be using his toys as a pillow in his own bed.
both mine got little kids pillows (sheridan i think and ikea also make nice ones) at about 12 months.... DS2 (16 months) loves his. they are quite flat but i find he loves to cuddle into it...
I've always rolled a towel and put it under the head of the bassinette, but I am yet to give the kids a pillow (DD is almost 3 and DS is 16mths) as I'm not sure when I should either!
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