diffuse cortical atrophy

We went and had a ct scan on my 4 month yr old son and it came back with this. The statement says " The sutures are patent. There is flattening of the posterior parietal bones. The ventricles are mildly dilated.. There is rather marked prominence of the cortical sulci and fissures indicating diffuse cortical atrophy. This is presumed due to intrauterine or perinatal insult. No high density is seen within the brain to indicate hemorrhage. There is no mass effect or sudural collection." What does this mean? We go to a neurologist this week, but I can't wait this long. He is devolping like he should be rolling grabbing laughing everything. We would not have guessed it if my wife was afraid of his head growing the wrong way.