Mummies, at what age do you let your lo use normal bolster instead of those beanspruts pillow or bolster?

Quite young, a few months? I had both types. The function is apparently to mimic a hand over them (comfort) Although he never really used them.. put a bolster for his legs to hug and in the middle of the night, they will be on separate ends. But strangely, he loves bolsters now and has 7 soft toys.