Re: How many calories is my 17 month old getting from BM?
This link covers the fat and calorie content of various milks (including human): http://kellymom.com/nutrition/milk/milkcalories/
How many calories your LO gets from your milk depends on how much he's drinking at one go. And there's no way to determine that precisely without weighing your LO before and after nursing, using a scale that is accurate to the 1/10th of an oz. You'd want to do it several times, and take an average, since intake can vary widely between feedings. Alternately, you could try pumping and see what you get, but that's not a good measure because the amount you pump varies based on time of day, your responsiveness to pumping, when you last nursed or pumped, etc. Even moms with great supplies will sometimes get very little at the pump.
I know it's very stressful having a small kid. I'm watching one of my IRL friends go through that right ow, with her tiny 10 month old.
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!"