my baby is 2 yrs old now...his weight only 9 kg..wich type of milk is suited for him???

Hi haseena -i started giving full cream mother dairy milk as we were in delhi. Full cream amul is awesome. If full cream doesnt suit u can use taaza - regular fat

i think formula milk for 2 year old baby wont work out.  u can try options as asha said and also talk about his diet with ur pead. 
u can include weight gaining foods too in his diet.