I wouldn't be concerned! I got my girl when she was two months old, and she only weighed about 90g. Now, she's eight months old and is still small for her age at 180g. She came to me from a rough situation, so I chalk her slow start up to that. Now, even though she's an amazing eater and, like your boy, has healthy body proportions and is always putting on weight, she'll probably always be a slow grower.
So yeah, I don't think it's anything to worry about! Some ball pythons are slow growers (like mine and yours), and some grow faster. One of my good friends has two bps from the same clutch, and at a year old one of them was twice the size of the other.
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