For awhile now Elijah has refused to say goodbye when leaving. He knows how to wave, but apparently got bored of it. No amount of coaxing to "Say bye to Daddy!" or "Say bye to your friends!" achieved anything.
Suddenly the past few days he's started saying "Bye". He says it in this very sweet, soft tone, with a short sound, almost like "By". He says it when he leaves a room. He says it when he trots off down the garden. He says it pretty much anytime he goes through the kiddie gate between the dining room and kitchen.