If you were to look at humans, then the growth of the body is a lot more than that of the brain, so I don't think that it would cause any problems, since we're fine with it
I learned in bio class that the humans developed a lot in the brains, so I automatically assumed that the growth of the body was less or equal to that of the brain in humans.
But I guess humans' development in the brain was considered "a lot" in comparison to other animals.
Yea, for the maintenence of our bodies we just use our Cerebellum, which is quite small.
Brains don't need to be very big, unless one wants to do additional stuff with them. Like thinking
Sometimes thinking is such an unwanted option, but without it I wouldn't be here.