Comfort objects are a curious stage. For a while it was a monkey stuffed animal, then a duck. I can understand being attached to those nice cuddly objects.
The last few weeks Thing 3 has become attached to a flashlight. He carries it around the house, takes it to school, keeps it with him when he eats, and takes it to bed.
Yes, the batteries will run out soon. Yes, this will cause Thing 3 to have a tantrum. No, I’m not going to keep putting in new batteries if he leaves it turned on 24/7.