Siupak01,
For 埋身餵真係吾知佢飲幾多, as long as your baby :
1. gain weight
2. wigh at least 6-8 wet diaper
it means your baby has enough milk.
PLs don't give up breast feed. To reduce the workload, you can bf directly (not to 泵奶). Right now I wake up 2 times per night and it is OK. Though sometimes very sleepy. I will sleep earlier and take some nap during day times. Also my husband will share some housework for me.