Baby struggling during feeds

We’re currently having some issues with our newborn (2 weeks old) when trying to do her feedings.

One of two things usually happens: 1. She falls asleep and refuses to open her lips to continue feeding 2. She struggles and squirms uncomfortably even though she continues to show hunger cues

In both cases she sometimes just sucks but doesn’t actually drink.

I’ve been exclusively pumping with top up formula but am worried she is not going to get enough food. She has averaged around 12.5 oz total intake the last three days. She continues to pee almost every diaper and has a bowel movement once a day. We’ve tried burping frequently throughout the feed and switched different bottles but that has also not helped. We’ve also done exclusive formula feeds to see if it was my breast milk but that also didn’t change anything.

Anyone have a similar issue with recommendations?