LO doesnt nurse long

Kristin

My 3 week old only nurses for about 10 minutes total about every 2-2.5 hrs during the day - most of the time on one side and when I go to switch sides shes asleep or has no interest. I’ve kept her up, burped in-between etc. She is gaining weight but is this normal? Will this affect how much milk I produce as I will need to pump soon to save for when I go back to work.