Opinions Please

My child has been in infant care since 3 months old and he just transitioned to PG. I have been told by his teacher that he does not run or hop during the acitivities whereby he is supposed to do so. He is only 19 months. He can walk,talk and seems to function normally but i'm doubting it after what i've been told by the teacher. First time Mama here so i'm worried. Is there anything I need to do help him?