My 6 month old baby seems to be irritated most of the time. He makes screeching noises and cries a lot. He's been suffering from cold since last 3-4 days but his behavior has been like this from past 10 days or so. Also, he is facing difficulties in sleeping during the night. Wakes up every hour and starts crying. We are unable to understand that whether he is hungry most of the time or can something else be the reason for his irritable behavior.