Hi so Harvey has had a little cough for a few days but it's only when he is sleeping or crying or…

Hi so Harvey has had a little cough for a few days but it's only when he is sleeping or crying or feeding no other time he doesn't have a runny nose but when he needs to cough I can hear he has something in his chest and when he coughs his eyes water and sometimes makes him sick any ideas or just a cough? Thanks x