Pumping and Attaching to Breast

We had our 5 day check up today and baby had 6% of his birth weight. While I know this is normal the midwife suggested I try pumping and attaching to the breast - then using the expressed milk to top up baby during feeds.

I was planning on trying this later on as baby is cluster feeding at the moment and thought it be best to wait to pump. I’m a little confused on when I should pump as I’m just about getting a break from attaching to the breast at the moment 😭😮‍💨

Has anyone else tried this?