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.
What causes premature birth? Babies born before 37 weeks gestation are considered premature, and according to Tommy's the baby charity, around 7% of all babies born in the UK in the years 2001/2002 were born prematurely. Some babies born early are fine; they are just small. But often when a baby is born preterm, his organ systems may not have had time to fully develop. According to Tommy's, the majority of preterm births occur without any obvious cause or known risk factors.