Plagiocephaly

So my son got diagnosed with plagiocephaly. He's flat is kind of noticeable. My 4 month old had his well visit this week and I let the nurse know I was concerned about his neck and head. My son usually turn his head to one side and seems to struggle turning his head to the other side and he has a bump on his head. The nurse said that when she measured his head circumference she did notice his head not even. Unfortunately, my son's pediatrician wasn't there so another pediatrician saw him. I talked to her about my concerns and she didnt even look at his head or neck at all but she did refer him for physical therapy. She said that she could refer him for a helmet but she wouldnt do it unless it were severe. I really dont know how bad his head is. I dont know if I should consult with his pediatrician to see if they do recommend him a helmet or not. I just want whats best for him and I dont want this affecting him in the future. Does anyone think he might need a helmet? Also on his flat side he does have a smaller eye and ear too :(