What to Do When a Child Suddenly Develops Stuttering?

In mid-August, I took my child to the seaside for fun. I didn’t apply sunscreen on the child and neither did I dress them in protective clothing. After returning, the child seemed to have developed a sun allergy. The child already had an allergic constitution, and their body started to itch, eyes became red, and they started sneezing and running a nose. Then, they began to stutter. What should we do?
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