Hello! The child has diarrhea since yesterday. Could it be from teeth?…

Hello! The child has diarrhea since yesterday. Could it be from teeth? Or from amoxicillin? We had a flu last week. And we took amoxicillin. Amoxicillin is an antibiotic. The pediatrician wrote that the child has diarrhea, and she replied "give him/her children's linctus" and that's all. I gave him/her some today but it didn't stop. The stool color is yellow straight.