^^ What she said. Except....


What I understand re composition is that it is related to frequency of feeding. so the longer between feeds, the lower the fat content (I think) and vice versa.
I've read the opposite of that ^^ That the fat content balances out no matter how frequent your feeds.

I do know that Baby Whispering types recommend expressing in the evening in the early days, but that's based on their fill-em-up before night philosophy I think.