bought one for my mom so I had to buy one for my youngest baby, she's 21 months old and the last few days she was irritable and whiny... I don't know why, she doesn't seem like she was teething but I went ahead and got a necklace, literally got it within 2 days!!! she's been wearing it for about 2 hours now and putting her to sleep was a breeze, the fussiness went away almost immediately! its incredible and again, I will definitely be buying again...maybe a bracelet next time lol -one happy mother of 3