It may refer to the manufacturer. Search MBI and doll and you will see a search result for a company called MBI, Inc. They have been around since 1969.
Smoking during pregnancy reduces the growth and health of babies and increases the risks of a number of complications and illnesses for both the mother and baby. Babies born to women who smoke during pregnancy have a greater chance of premature birth, low birth weight, stillbirth and infant mortality.
Premature infants, known as preemies, come into the world earlier than full-term babies. Prematurity is when a pregnancy lasts less than 37 weeks; full-term infants are born 37 to 42 weeks after the mother's last menstrual period (LMP). Thanks to recent medical advances, most premature babies survive.