According to researchers, parents are less likely to suffer from a cold than non-parents. Researchers from the Carnegie Mellon University exposed about 800 adults to the common cold virus and then monitored them while in quarantine. They found that parents with one or two children were 48 percent less likely to get sick than their childless peers.
The research suggests that the positive affects of parenting such as a stronger support system, companionship, and life satisfaction associated with raising children may provide a type of protection of the immune system. The study also found that the more children in a family, the less likely a parent would be affected by the cold virus, with the protection factor increasing to 61% for those with 3 or more children.
Source: Psychosomatic Medicine, July 2012