I have in my hand a beheaded duck (toy)- need advice.

[Pithlet]

Actually, this is serious. One of my little boy's favorite toys is this little squishy stress reducer thing in the shape of Aflack, the duck from the insurance commercials. His head has come off. What kind of glue is best for that type of material? It's one of those little hand held things they give out at offices a lot that you're supposed to squeeze to reduce stress. It's a very dense foam. I'm afraid if I use something too strong it will eat at the material. On the other hand, I don't want the head to come off again, inducing further trauma to my kid. I hate to just take it away.