I used to work in pharmacy.. Demazin used to come in infant drops, which were exactly the same as the regular solution just marketed in a smaller bottle with "infant" written on it for the share in that market too. I vaguely remember they upped the minimum age on them to two years. So they used to be safe, but now not so much... Makes you wonder hey!? Paedamin was almost exactly the same as demazin, just made with a different antihistamine, and I think I remember the dosage on that started at 6 months? Give your pharmacist a ring and check but I'm sure there will be something suitable for your little one. To be honest though, I never found that any of those mixtures really did much, especially cough mixtures, even the pharmacists that I worked with said they were all a crock, just a money maker. I used to just use panadol with my dd.
HTH x