When my dd was 10kg she was on 10mg so I think it is around 1mg per kilo of weight, However, I am NOT a doctor, please dont take my advice!

I found my Gp knew nothing really bout reflux, thats why going to a paediatrician is great. My dd is almost 2.5years so we have been seeing our paed regulary for all that time. She has only just come off her meds to see if the reflux is gone, we tried other times but all the symptoms came back.