My son is 6yrs he has a soft spot still on his head. did not see this until we gave him a short hair cut.?

what could this be or is this something normal?My son is 6yrs he has a soft spot still on his head. did not see this until we gave him a short hair cut.?
Was he by any chance premature? It can be normal. Large soft spots take longer to close and they could be a sign of something else, but your doctor should have picked up on something if there was.My son is 6yrs he has a soft spot still on his head. did not see this until we gave him a short hair cut.?
You need to take him to the doctor. The soft spot should have closed ages ago. Get his doctor to check

sebum