P.G.
I hate to say this, but not all kids sleep through the night till they're much older. And they go through so many changes that even if they do, they can fall out of it again. Mine is 4 and is not a full night sleeper. I have a friend who had 4 kids and they all had different sleep styles. Hopefully some moms might have strategies that'll work, but you may have to suck it up if you're stuck with a non-through the night sleeper. Good luck!