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.
In addition, when a smoking woman becomes pregnant she is at risk of spontaneous abortion, or death of the foetus within her (intrauterine death) and even when she does carry the foetus to full term the child will likely display problems associated with its mother's smoking during pregnancy.