@beth314 Hey Beth, the people giving you advice and reassurance so far have much more experience raising puppies than me. I'd defer to them. BTW, we weigh both of our dogs weekly and keep a log.
Something else to consider; although, it may be comparing apples and oranges. Logan was almost two when I brought him home. At first his appetite was veracious. He didn't eat, he inhaled food. Then, after about 6 to 8 weeks his appetite changed. He started getting picky and took forever to finish breakfast. I experimented by eliminating one ingredient at a time to see if something had gone bad or if he simply didn't like it anymore. Nothing really made any difference. Not long after we sprinted south to gather Sparkle up and bring her home. Once she was here at home... Logan's appetite exploded again. Back to inhaling meals regardless what was in it. In his case... I have to wonder if he just got lonely and was maybe a bit depressed.
If we hadn't gotten Sparkle, I'm not certain we'd have figured that out.