When new parents become unhappy, brothers and sisters become less likely

Couples who perceive a drop in happiness in the first year after they became parents, have a lower probability of having a second child. A study by the Max Planck Institute for Demographic Research (MPIDR) in Rostock, Germany, has shown that the larger the loss in well-being, the smaller the probability of a second baby. The effect is especially strong for mothers and fathers who are well educated and older. —> Read More

Viruses thrive in big families, in sickness and in health

A study led by the University of Utah School of Medicine finds that every child puts a household at increased risk for viral infections. Childless households had infections during 3-4 weeks of the year, while families with six children were infected for 45 weeks. But only half who tested positive reported feeling ill. Published in Clinical Infectious Diseases, the results can help families and health care providers know when illness should be cause for concern. —> Read More

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