My DS (3.5yo) just started sucking his thumb. WHAT?! So I've noticed starting this fall he'd put his fingers in his mouth (like the tips of a few fingers at a time) when he was upset. I discouraged it by redirecting him, offering a tissue to clean his hands, and/or asking him why he was doing that (often was because so-and-so does it).

More recently I've caught him full on sucking his thumb. Today he was doing it when he was having a meltdown but on Friday he was doing it just as we drove home and he was looking at Christmas lights in the window.

Anyone else have experience with a child deciding to suck their thumb way older? Also worth mentioning that he was never a thumb sucker or paci child.