Well, if I had known that would be all it would take to get him to sleep through the night, I would have done it a year ago! What, you ask? Well, I just told him to go to sleep.
Let me explain... as he was drinking his warm milk before bed, I set him on my lap and told him that his sleep schedule has been completely crazy lately. Even the night I finally got some sleep, he still got up with Daddy for a bit. I informed him that Daddy had to get up early in the mornings for work, so we can't be keeping him up with crying. Then I reminded him that we go to the gym during the week and we need to be well-rested... Mommy has to be energized for a hard workout so she can get fit and healthy and he needs to be ready to play with all of his new friends that he's made in the daycare.
After he finished his bottle, I did the same nightly routine of changing his diaper, reading him a story in the rocking chair, gave him a big hug and kiss, and placed him in his crib. Instead of instantly crying, he rolled over on his belly, sighed, and fell asleep. That kid will even wake from sound sleep and start screaming as soon as I place him in his crib, so this was huge! He never cried last night... that was a first. He's still asleep. I had to check and make sure he was still breathing! Haha.