Cold and cough

A

Hi. My both of my kids got a cold and cough at the same time. It's been about 2 weeks now and my toddler is much better since I can give him medicine/honey to treat all of his symptoms - just a runny nose left now. My 5 month old however is still struggling. We've been giving him hylands cold & mucous everyday. And we've been using the nose Frieda, Burts bees vapor rub,, and humidifiers to help with congestion. Although he is doing better his cough still worries me and that's the only thing I can't treat at this age. His sleeping and eating patterns have all changed significantly and I'm just worried. Anyone have any tips or tricks to help? I'd be grateful.