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Avoiding scrubbing the scalp until the scales disappear is inappropriate. While avoiding excessive scrubbing is recommended, it's also important to address the scales to prevent them from accumulating and worsening the condition.

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Using soap and water and avoid shampoos is inappropriate. Soap may not be as effective as specially formulated shampoos for treating cradle cap. Using a gentle baby shampoo designed to treat cradle cap can be more effective.

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Using a soft brush and gently scrub the area is correct. When instructing parents on how to shampoo a baby's hair with seborrheic dermatitis (cradle cap), using a soft brush and gently scrubbing the affected area can help to loosen and remove the scales. It's important to be gentle to avoid causing any irritation or discomfort to the baby's delicate scalp.

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Avoiding washing the child's hair more than once a week is inappropriate. Infrequent washing may not effectively manage cradle cap. Regular, gentle washing with an appropriate shampoo and brushing can help prevent the build-up of scales.