Should i be concerned if my stepson, 17 1/2 yrs old, still sleeps with a stuffed animal. he even packs it with him for vacations.?

Unsure: What is the harm? If it doesn't cause any harm, I wouldn't worry about it. Has he been through some trauma? Sometimes, people need something to help calm them, and decrease anxiety. Perhaps he just likes having something under his arm- some people sleep with a pillow there. In the long run, I don't think it's a problem unless *he's* concerned or it prevents him from interacting with others. .