I think my almost 9 week old is going through a growth spurt. My milk doesn't seem to be keeping up though. He used to only want to eat every 4 hours and now in the evening he wants to nurse more like 2 hrs. And he was only doing one breast and now he's back to downing both of them. Should I give him some of my expressed milk to hold him over after he nurses?

Will that hurt my supply?

I'm so confused because my mom says my body will just adjust to what he needs so I don't know what to do.

Any idea/help?