I have 8 year younger twin brothers, were preemies & identical. they had their own lingo for the first 3-4 years, some of it we never did decipher, but they knew what each was saying....yi-yol..(yellow)for banana....when looking for his brother it was always .. patting chest saying "two-two" .. I know there were years of their lingo but by the time we learned some of it they were speaking grown-up....but these were the ones that always stayed with me. Hard to realize those itty-bitty babies will be 59 this year.