It's really hard to give more advise without knowing what is going on. You need to invest in a scale that weighs in 1 gram increments. You can get them for about $25 online. That way you can monitor if there is improvement or not. I would not recommend assist feeding him unless that is the only option and I don't know enough to give an opinion. You can drip water on his nose and see if he'll drink it.

You need to find the underlying problem. Being underweight is the result not the problem.

You need to bring him to the vet for an examination and an objective opinion on his condition, as well as a course of action. It really sounds like this is something you should do right away.

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