Hi and welcome to YT!
Have you taken him to the vet since you got him for a wellness check up? If not that's what i would do.
what is he eating and how much is he eating? 9 weeks old is still too young to be taken away from his mother. They need to stay until at least 12 weeks old. the problem might be that he is just not used to eating kibble if that is what you are feeding him.
also, how much does he weigh? if he's small you need to worry about hypoglycemia since he's not eating well and is lethargic. check his gums and make sure they are nice and pink. you need to make sure he is eating at least 4 times a day because he is so young. also make sure he eats right before bed so he does go hypoglycemic during the night. If he's not eating well the nutrical will help, but you don't want to overload him with it.
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