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.
Causes and Prevention of Premature Birth. Premature birth can have many causes which include problems with the fetus, the mother, or both. However, about fifty percent of the time, the cause or causes of a premature birth are unknown. When the cause is known, premature birth most frequently comes as a result of a premature rupture of the fetal membranes which initiates labour.