DD was diagnosed with strep yesterday and she's gotten a rash all around her mouth (treating with Aquaphor) and her bottom is getting big red dots too. I've been putting a ton of extra strength diaper cream on it, but she starts complaining 20 min later and rubbing her butt on the floor (like how a dog would itch. Funny, but not funny cause she's sick. Lol)

My mom suggested baby powder, but I don't have any. Tried cornstarch, but that didn't help her. Is there anything else I could try? I'm thinking a bath might help. Tepid? Baking soda? Oatmeal? How exactly do you give a baking soda bath to a 22month old?