Can i use a small amount of benadryl (diphenhydramine) on my 6 month old. she is scratching a lot. i took her to the pediatrician who said it was contact eczema but now her face is itching too?

Cetirizine (Zyrtec): The recommended dose of cetirizine (Zyrtec) for use in children 6 months to 23 months is 2.5mg (half teaspoon) one per day. In addition, contact your pediatrician and tell them the symptoms are persisting. Give lukewarm baths and moisturize her skin afterwards, avoid frequent baths, keep her fingernails trimmed short, cotton clothing, and remove irritants