My 6 weeks baby has rash on face, neck and body,?

Baby acne: Baby acne is a common event that reflects hormones transferred during the pregnancy. While the baby is floating in moisture, the skin is will not break out, but within 1-3 weeks after birth they break out for many weeks until the hormone levels drop & the acne disappears. Keeping the skin clean ; avoiding irritating soaps helps.It has no relationship to allergy. If it persists >; 3mo needs eval