American doctors say that mothers smoke before their 76.______ babies are born may slow the growth of their babies 77.______ lungs. They say’ reducing lung growth could cause 78.______ the babies suffer breathing problems and lung disease 79.______ late in life. Doctors in Boston studied 1,100 children. 80.______ The mothers of some of the children smoked; the other 81.______ Mothers did not. Doctor found out that the lungs of the 82.______ children whose mothers smoked were 8% less developed as 83.______ the children whose mothers did not smoke, that the 84.______ children whose mothers smoked were developed 20% more 85.______ cold and breathing diseases than the other children.