There is alot of variability in hatchling size depending on how they eat.

I have an 08 female born in late July that was a very slow starter and had to be assist fed who is now eatting fine but only weighs 100g.

On the other hand I have an 08 male (Lemon Pastel Axanthic) born in early July that is 550g full and eats small rats.

If they are being offered appropriately sized meals every 5-7 days and are eatting fairly consistently they should grow for you.

A vet exam only hurts your wallet if you are concerned.

Hope that helps.