How to take care of 22 days dog?

Hello, how are you all? I have a dog of 22 days. And he is so minor so I don’t have any idea that how I can take his car in the best possible way. I think somewhere he is not healthy and I saw many changes in his nature. And I don’t what should I give him to eat at this stage. I wish some experts will read my post and answer me accordingly. Because I want to make him much stronger. By which he will not have to face any health issue. Please help me to get out of this difficult situation. I want someone who will offer me some steps by which I’ll be able to take his care properly.

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