1 year old with bad cough! Help!

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Hello mommies! My 1 year old has runny nose and bad cough. I've been giving him the Zarbees every 4 hours as indicated but I feel like maybe it's not working. Since last year he hasn't had his shots which he will in 2 weeks. He's been out of the country for two months and I'm starting to feel it's because of that.

For now I'd like advice how I can make him feel better?