The extra-small size features a snap - down front to protect the delicate umbilical cord area for the first few days and are designed to fit babies from 5 - 11 lbs. (thespruce.com)
A snap - down front protects baby's sensitive umbilical cord area, reducing irritation while it heals. (diaperjunction.com)
Despite what you have heard, there is no need to use rubbing alcohol to clean baby's umbilical cord area if it is still attached. (wikihow.com)