Talk to Pediatrician on Loose Watery Stool

Salam dr mera beta 2 years ka hai us ko 4 5 din se watery stool horahey hai din mai 4 se 5 baar motion karaha hai jb wo 1 saal ka tha usko lactose intolerance hua tha lekn jb vomiting karta tha wo par ab srf doodh peekar nhi kuch bhi khata hai to esey hi stool pass karaha hai or kbhi kbhi srf pamper mai colour aata hai itna watery hota hai kindly aap bataye k is ki kya wajah hai or isko taqreeban har month esa hota hai dr ko last month jb dikhaya to antibiotic se theek hogaye they lekn us k baad ye sahi solid stool pass karney laga tha phr yehi sb horaha hai plz plz guide karey k iski kya wajah hosakti hai???