At a little over 2 months old, Justin's at a stage where he needs to suck on something or he'll go nuts! He hasn't gotten used to any pacifier yet (and I've tried 3 different ones) but he does like sucking on the outside of my thumb (bordering on my palm) when I'm supporting him while he's sitting upright in front of me. He's got some incredible suction power there!... I'm surprised he hasn't given me a hickey there on my thumb!... Funny guy!