Should I Be Concerned About An Infant S Diet, Appetite When They Have Diarrhea While On Oraxin Syrup?

Hello, I have an 8 month old baby who doesnt want to drink milk, tea or porridge. she only takes breast milk and fresh fruit juice . Recently i started giving her Oraxin syrup and her apetite is quite picking up and she now takes yoghurt very well, she eats, cake, food juice but still hates milk or porridge. She has diarrhea though, am guessing it s from the syrup. Should i be worried please? Please adviseon what i should do best for my girl please.