That's smallish, but not really unusual. I have had clutches where the babies were 4 and 5 grams. It's fine- they just take a bit longer to get going than the 8-9 gram clutches.
Some people think incubation temperature influences hatchling size, but I haven't really seen a relationship. I incubate at 80-82, which is low, and still have females whose babies are small.
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