Cesarean delivery may increase kids' asthma risk

Babies born by Cesarean section may have a moderately increased risk of developing asthma compared with those born naturally, Norwegian researchers report after investigating this link in a population-wide study.

Dr. Mette C. Tollanes, of the University of Bergen, in Norway, and colleagues looked at the modes of delivery among more than 1.7 million single births reported to the Medical Birth Registry of Norway between 1967 and 1998. They used registry data from Norway's National Insurance Scheme to determine the number of children who, through the age of 18 or the year 2002, developed severe asthma.

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