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For the first time, scientists have found evidence of specific and long-lasting changes in the brains of pregnant women. The changes were measured in brain areas that are responsible for social cognition and the ability to understand the thoughts and intentions of others, suggesting that they may intensify maternal bonding with a newborn. (Nutt, 12/19)

U.S. women are increasingly using marijuana during pregnancy, sometimes to treat morning sickness, new reports suggest. Though the actual numbers are small, the trend raises concerns because of evidence linking the drug with low birth weights and other problems. In 2014, almost 4 percent of pregnant women said they’d recently used marijuana, up from 2.4 percent in 2002, according to an analysis of annual drug use surveys. (Tanner, 12/19)