hi- advice needed- i have been given an amber teething necklace for my baby who is 9 weeks old. does it work? I have been advised to leave it on all the time, but surely that is a bit dangerous? its short, so he can't get it on his mouth. But what of he pulls it and it breaks and he swallows beads? the person who gave it to me considers themself a baby expert will be v hurt if i don;t use it, and is putting pressure on me and dp-we have already argued about it