During sleep background activity consist of symmetrically bisynchonous, fairly developed medium voltage 4-5 hertz theta waves seen best posteriorly. ?

Normal for age: I suspect you've left out some additional information but this appears to be normal for his age to me. The posterior rhythm they mention may be a tad slow but then, again this is during sleep with eyes closed so it's fine. Are they looking for seizures or is he very lethargic? Looks like pneumonia is under condition so I'm wondering if he's battling with that now or that's a previous condition