Frequent colds

Maria

I feel like my 15 month old is always sick and he doesn’t even go to daycare. March he had covid. April he had an ear infection and canker sores on his tongue. May minor cold symptoms. Now he’s got another cold and his voice is hoarse. My poor baby sounds so bad. Are colds that common at this age? Or could it be related to him being a full term NICU baby?