My baby boy is gonna be 3 mo on Dec 13th. He HATES his car seat. I've googled different things to try for him to get used to his car seat, but nothing has worked. He screams and cries so hard and for so long that he starts choking and coughing which makes me very nervous. He never falls asleep in the car seat, just cries. I've even switched his initial car seat twice. Any recommendations?