My lo is five months old. He starts crying insanely hard at times for no apparent reason. For example today as soon as I put him in the car seat he started screaming like he got very scared or like something bit him. Another example, he was sleeping in his car seat and when he woke up I started talking to him and he was smiling at me but as soon as I picked him up he starts screaming in the same way. One time he woke up screaming like this. I don't know what's going on? When this happens and he starts crying it's hard for him to