So my 2 year old up until this point did not have any kind of lovey he was attached to (even though I've bought a couple of the small blanket/stuffed animal combo ones for him). Well he has become very attached to this giant fuzzy thomas the train blanket, like it will cover a full size bed. I have tried substituting it for smaller comparable things (fuzzy, thomas, fuzzy thomas) and it's all a no go.

Has anyone ever successfully swapped out a lovey, and not just snuck in a duplicate for laundry, daycare, or loss?