Loose stool. For understand the problem.

My girl 7 month old,i give 2 times 1 scoop cereal(rice)per Day And I am also continue motherfeed.but she has loose stools problem from the 1st month onwards.everyone Said"its a normal after completion of 3rd month it will change automatically".5th month we take a motion test for this problem,the result is mucus And bacteria present.they give medicine.at one stage overdose leads to loose stools.so we are stop to give medicine that problem solved.but 2 days once she have loose stools problem up to now.Even giving white rice in that day also Same loose stools(with mucus).I don't know what type of food I will give.if need any scan for understand the problem. I don't know what can to do.please help me sir/madam please.