Which method is considered unsuitable for cleaning vernix caseosa from an infant?

Using friction to rub off vernix caseosa is considered unsuitable because this method can be too abrasive for an infant's delicate skin. Vernix caseosa is a natural, protective coating on a newborn's skin that helps to prevent water loss and provides some antibacterial properties. Gentle cleaning methods are recommended to avoid causing irritation or damage to the skin.

Wiping gently with a soft cloth, washing with warm water, and using a moisturizer are all appropriate methods for cleaning vernix caseosa, as they help to remove the substance without harming the fragile skin of the newborn. These methods ensure that the vernix is handled delicately, allowing for safe removal while maintaining skin integrity and comfort.