Need help

Nikki

Ok so I was pumping 3 to 4 oz at a time my son is 5 weeks old and he had diarrheal a lot so dr said give him a few formula bottles n it helped but now all I can get half a oz to 1oz at a pump and I can only get that out twice a day what can I do I really want to start feeding again full time or at least way more then 1oz twice a day please help what can I do