What should children do if they stutter suddenly?

My daughter is now 20 months old and speaks fluently. This happened suddenly more than a month ago. The first word has to be said many times. I was scared and took her to the children's hospital. The doctor said it was a physical stutter. I don't know how to express it because the child's vocabulary has increased. Don't worry, she will be fine in a week or two, but my daughter will be fine in less than two weeks. Don't imitate him when he stutters. When he stutters, don't show too much concern, as if you didn't hear him. When he is particularly anxious to express himself, his parents can help him express his meaning, and it will be fine in a few days.