Preschool registration

I registered my sweet little Prince Charming for preschool today. He's not yet 4 so I don't know if they'll let him in or not, as they take 4 year olds first. He got a referral for hearing and speech. I figured he'd get one on speech, but thought his hearing was ok. The tester said that if he had a cold then fluid behind the ear would show that reading. He had one a couple weeks ago and she said that it could still affect his hearing.