Pregnancy and childbirth

FILE - In this Feb. 13, 2018 file photo, a week-old baby lies in a neonatal intensive care unit bay at the Norton Children's Hospital in Louisville, Ky. This particular NICU is dedicated to newborns of opioid addicted mothers, that are suffering with newborn abstinence syndrome. The area is kept dark and quiet due to increased production of neurotransmitters in newborns of addicted mothers, which can disrupt the nervous system and overstimulate bodily functions. A study in Tennessee released on Thursday, Aug 30, 2018, found learning disabilities and other special education needs are more common in young children who were born with symptoms from their mothers' prenatal opioid use. (AP Photo/Timothy D. Easley)

FILE - In this Thursday, July 12, 2018 file photo, a newly-transplanted cannabis cuttings grow in pots at a medical marijuana cultivation facility in Massachusetts. In a report released on Monday, Aug. 27, 2018, researchers at UC San Diego detected marijuana's mind-altering ingredients in breast milk of nursing mothers, raising doctors' concerns amid evidence that increasing numbers of U.S. women are using pot during pregnancy and afterward. (AP Photo/Steven Senne)

FILE - This Tuesday, Aug. 15, 2017 file photo shows an arrangement of pills of the opioid oxycodone-acetaminophen in New York. On Thursday, Aug,. 9, 2018, the Centers for Disease Control and Prevention reported that the number of opioid-addicted pregnant women shot up dramatically in the last 15 years. (AP Photo/Patrick Sison)

FILE - In this Friday, Dec. 16, 2016 file photo, Michelle Flandez stands in her home with her two-month-old son Inti Perez, who is diagnosed with microcephaly linked to the mosquito-borne Zika virus, in Bayamon, Puerto Rico. In the first long-term look at what happened to children of U.S. mothers who were infected with Zika during pregnancy, one in seven developed some kind of health problem _ranging from birth defects to conditions that became apparent only later. Health officials released the findings Tuesday, Aug. 7, 2018. (AP Photo/Carlos Giusti)

Professional tennis player Serena Williams appears at an event to launch a national street art campaign with Allstate Foundation Purple Purse to make domestic violence and financial abuse visible, at TicTail Market on Wednesday, June 20, 2018, in New York. (Photo by Charles Sykes/Invision/AP)