What to Do If Your 10-Month-Old’s Hair Is Thin?

My son is now 10 months old, and he had a full head of hair at birth. Since he had a serious illness in April (Kawasaki disease), his hair has been very yellow. He was shaved during the hospital stay, but now there’s a thumb-sized area where the hair doesn’t grow back. There are very fine hairs at the follicles, but they haven’t grown for so long. What could be the cause, and how should we handle it?
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