lots of fleas, scratching, bald spots, weight loss? what color are his gums? if they are pale he is probably anemic from the fleas. good thing you bathed him and took care of that.
as long as he's on a premium puppy food and is healthy he should start gaining weight soon. If he is pale and anemic i'd take him to the vet as soon as possible. that's no good for a tiny puppy.
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