Biscuit has had a cough since I got him at 11 weeks.

He always eats well and feels fine, his kennel couhg infection was gone a long time ago but the cough can sometimes take awhile.He is now 5 months and is just starting to get over it.My vet has put him on four rounds of antibiotics and I recently bought a vicks vaporizer and some vicks medicine to put in it and it has helped tremendously!It is only since I got the vaporizer that his cough started to get better

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Sounds like your baby could have kennel cough, has she seen a vet?