Tristan started saying “thank you” yesterday evening! We were in the shower, and I was trying to brush his teeth. He hates the tooth brushing, so I’m trying to use positive reinforcement for successes in getting him to try it – whether by himself or having me use the brush. One thing I say a lot as praise is “thank you!” And he echoed it back to me! It sounds a bit like “eat you!” and it’s SO DAMN CUTE. He’s running around the house saying it now, in fact. 🙂