I have a 6 week old IRN and he was normal ie. chirping normally and today I woke up to a muffled chirp. Is that normal for a chirp to sound muffled every now and then? Then, I went on youtube and made him listen to an IRN who was talking and he chirped normally and continued normally during the day. Now, at night before going to bed, he produced the same muffled chirp. Is something wrong? It sounds like he is chirping from the insides of his throat. Also, these last 2 days he has been bobbing his head continuously. Pls help as I'm very worried

Thanks.
Lea.