dylexic child

In reading class, I was assigned to take care of a group a children.There was this child who is 3 or 4 years old. He has problems with reading.He could not repeat the sentences that teacher taught him.He was struggling with the words.If the teacher taught him one word, he can reread the word but if it's long sentence, he got so blur and he lost interest in reading.I wanted to tell the teacher in charge of this activity about this problem but I think I was just thinking too much.In the end, I just kept quiet because ignorance is bliss, rite??What should I do.I wanted to help him but I was afraid that my assumption about him was wrong.haizz...