My 11 month old is coughing and I hear sound like there is a huilding phlegm

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Help! FTM here. He has been coughing for 3 days now. In the early days it was less but today he coughs more that I can hear a sound like there is a phlegm. What should I do?

Call his Pedia? Should I wait more? We don’t put him on day care. He is at home with me. We go out to groceries. We have construction going on in our house right now. People are in and out. Just in case, what are your less chemical meds for babe whose coughing?