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My sambava panther chameleon Bucky weighed 28g when he arrived last week(4.5 months old), this week he weighed 46g, and that was a day before his first shed with me.
What kind of chameleon do you have and what kind of scale are you using?
I am not an expert, but since no one else is replying I'll add a bit more. There could be a couple factors at play here.... You could be over-estimating the age. Your little guy could just be 3-4 months old and will start growing quite a bit real soon with proper feeding. Alternatively he could just be a runt of the litter, that's not to say he will always be tiny, but may just be a late bloomer. Chams vary in growth rate for a variety of reasons, and unless you know exact hatch date, average size of parents/grandparents/etc., then there is not really much anyone can do but speculate and give you information that may not accurately address your direct question/situation.
Hopefully someone more knowledgeable will step in and address your question to a better standard than I have.
I'm going to attach a blog that shows you two different panther males growing at vastly different rates, although they were raised the exact same way: Two Panthers Growing Up - Photo Progression
Growth is something that I see freaks out new keepers the most, and in most cases there's nothing to worry about. It's always a good idea to get a chameleon checked for parasites regularly, and particularly if you're concerned that they aren't growing/gaining weight just in case. But usually it's just that not all animals grow at the same pace.
As an added example, the blue chameleon in the blog, Daedalus, was 20g when I got him at 2.5 months old. Where as I got a different Ambilobe male who was 6 months old and weighed 26g.
I wondered this myself my ambilobe male is around 8 months and weighs 67 grams