Redness in that area indicates your infant couldn’t digest Lactose based milk and other formulas.. it’s just a temporary issue and can be corrected. please get consulted and get ur infant examined for the cause.
Next Steps
Child may need 1) Ointments like Siloderm in the perianal area and 2) also stool tests for reducing substances.
Health Tips
Make sure child is hydrated and voiding urine adequately