3 Day old Puppies.. Some get food some cry all the time.. What do I do?

My Chocolate lab just had 1/4 golden Ret. 3/4 Lab puppies. 7 to be exact. I'm afraid that she isn't producing enough milk to feed all of them as there are 3 pups that continuously cry... all the time. My husband doesn't think we need to take them to the vet but I think we should. Maybe it would be helpful to our lab if all the puppies were well fed and gave her a break, she is warn out and has not slept at all in 3 days. Should I go to the vet and get some bottles and supplements?