Boy Smell

I've always known that boys have a distinct smell. I have three brothers. But I didn't realize it starts at such a young age! While trying to figure out what it is that Jordan's smell reminds me of, I realized he smells like mac n cheese. Chronically. I can bathe him with his strawberry smoothie scented shampoo/bodywash, but only hours later he smells like mac n cheese again. Even if he hasn't eaten any mac n cheese in days. What is the deal with this? He eats a ton of cheese, so I get that part. But where is the macaroni smell coming from? And why don't girls have the weird smell thing?