Does brain development have anything to do with how much sleep?

Patient's question:

Hello, my son is two and a half months old, but he sleeps very little. I heard that more sleep is beneficial for a child's brain development. Is it true that children who sleep less are not as smart as those who sleep more? Is that right? What else is related to brain development? Thank you

Doctor's answer:

Hello: The situation you mentioned is not a problem! No need to worry!