TL;DR: 2 year old won't sleep, CIO doesn't work.
My son is just a little over 2 (turned at the end of July) and has never been the best sleeper. Up until 6 months old, he slept from 8:30-12:30 (with random 10:30 wakings) would eat/nurse, go back to sleep in bassinet, wake up between 2-4 nurse...