Phillip Underwood and Michelle Sheridan and their children, Logan and Lilliana, gather in their living room in Frederick, Md., after a long day of work and school. The couple had delayed marriage, in part for financial reasons. James Clark/NPR hide caption

itoggle caption James Clark/NPR

A recent UCLA study found that screen time could negatively affect children's ability to read emotion. But scientists are still unsure how much screen time is too much for a child. Anatoliy Babiy/iStockphoto hide caption

itoggle caption Anatoliy Babiy/iStockphoto

Psychologists say spanking and other forms of corporal punishment don't get children to change their behavior for the better. Science Photo Library/Corbis hide caption

itoggle caption Science Photo Library/Corbis

Dale Conour with his son Quinn, 2. Conour's two children from a previous marriage were already young men when Quinn was born. Rosanne Sax/Courtesy of Dale Conour hide caption

itoggle caption Rosanne Sax/Courtesy of Dale Conour

Lindolfo Carballo, an immigrant from El Salvador, meets his son, Raynel, outside school. In El Salvador, he says, families often "teach their boys one thing and their girls differently." He's trying to set a different example for his children. Sarah Tilotta for NPR hide caption

itoggle caption Sarah Tilotta for NPR

This hangout spot in East Baltimore — like the rest of the city's outdoor spaces — now comes with a police-enforced nighttime age limit. Children under 14 must be indoors by 9 p.m. each night, all year long. Kids age 14-16 can stay out a little later, until 10 p.m. on school nights and 11 p.m. on other nights. Courtesy of Brian O'Doherty hide caption

itoggle caption Courtesy of Brian O'Doherty

Amy Myers talks with her son Kamron, 18, in the backyard of their home in Boise, Idaho. She has found raising a teenager to be extremely stressful. Kyle Green for NPR hide caption

itoggle caption Kyle Green for NPR

High school students whose friends posted photos of drinking and smoking were about 20 percent more likely to become drinkers or smokers themselves. iStockphoto hide caption

itoggle caption iStockphoto

In the Institute for the Unsalvageable in Sighetu Marmatiei, Romania, shown here in 1992, children were left in cribs for days on end. Tom Szalay hide caption

itoggle caption Tom Szalay

Being the littlest may mean more protection and care from parents, psychologists say. Getty Images/Image Source hide caption

itoggle caption Getty Images/Image Source

Colleen Frainey, 16, of Tualatin, Ore., cut back on advanced placement classes in her junior year because the stress was making her physically ill. Toni Greaves for NPR hide caption

itoggle caption Toni Greaves for NPR

Play now, pay later: consistency matters when it comes to kids and sleep. iStockphoto.com hide caption

itoggle caption iStockphoto.com