Does cranium size determine brain size?

Does head size determine brain size?
Does the size of someone's head show the size of their brain. I'm not talking more or less intelligence by the way I'm talking about the size of the actual brain. So let say two guys one of them has an average head size and the other have an above average head size. Does that mean the first person have an average brain size and the other person has a brain that is little bigger. I'm guessing yes since I read somewhere that the skull when not fused together expands contained by size to make room as the brain grows. Is there any type or rare condition where on earth the brain does not grow but the skull does in size cause I know there are some conditions resembling microcephaly where the head stays small
Answers:
A Baby's Brain Is Not Yet Developed Until The Baby Has Fully Grown.A Full Grown Humans Brain Is The Same Size As 2 Fist Put Together.If Some People Are Not Very Smart...It's Not Because Your Brain Is To Small.It Just Depends on how much u study or learn something aka how much erudition u put in ur brain
Generally, the brain's smaller than the skull. In my case, it's considerably smaller.

Babies' skulls are not fused nonetheless and do expand to accommodate brain growth until full size. But some conditions result in unusually large skulls, namely: megalencephaly (enlarged brain), hydrocephalus (water on the brain), cranial hyperostosis (bone overgrowth).
lone in human
that's why little richard is so smart
Just a guess, but have you tried "macrocephaly" ... macro being the antonym of micro.
Generally brain size determines head size. Cranial synostosis, or premature closure of the sutures restricts brain growth, and mental retardation commonly results if uncorrected. Conversely, in uncorrected hydrocephalus the head size can increase dramatically secondary to the expanding fluid inwardly the brain.

I'm sure someone has researched head size and IQ, but the two are not necessarily directly proportional.

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