Looks like poison ivy, but I’m not sure. It was already there when I picked her up from her mothers. The areas are red and do appear to be dry already, as if there isn’t any more oil coming out to spread the rash.
My 5 yr old son had it on his back and groin area. Several times a day I would apply calamine and hydrocortisone cream to the rash. It helped him, hopefully it will work for your child.