Re: Reduced supply on one side
Your LO is 15 months old- by this time I bet he's eating a lot of solids and nursing more recreationally than he used to. Am I right? If so, the change in his nursing habits could explain the change in the amount of milk you can get when you pump. Maybe he's primarily nursing on the right, taking just a few sips from the left, and thereby allowing production on the left to dwindle.
If you're nursing on demand when you're with your baby, I see no reason to worry that you'll dry up. Your baby will keep you In production mode as long as he wants milk.
Coolest thing my big girl said recently: "How can you tell the world is moving when you are standing on it?"
Coolest thing my little girl sang recently: "I love dat one-two pupples!"