For any food, I think puppies need more than the rec amount...it also depends on their activity level...here's a link to their feeding guide/ calculator.
Stella & Chewy's - Feeding Guide
I'm, looking @ the feeding guide for S&C on our bag & it says Puppies: % of Expected Adult Weight, then it lists 10%, Multiple of Adult Requirement is 2.60...etc.
I have a baby scale that I weigh my dogs on once a month, they're all @ their ideal adult wieght. If they're losing weight, I up their food a little, if they're gaining, I reduce a little. Their weight only fluctuates between a couple of ounces.