Hi, I think I may have posted about this same issue a couple of years ago.
My step son is 11 years old and is still sucking his thumb. Not just in bed, but when he's walking around, in the car, watching a film etc.
He also has a small security blanket that he puts on his head when he's relaxing.
His birth mother abandoned him and his siblings when he was 4 years old, so I imagine this has much to do with it.
He starts secondary school in September and I'm worried he will struggle there. He has no friends at primary school. He says he doesn't suck his thumb there, but I'm not sure he even realises when he's doing it.
Does anyone else have a child who still does this?
What can be done?
Atm we're gently telling him to stop when we see him doing it.