(healthday) Two out of five American children between the ages of 8 and 10 have already taken a few sips of alcohol, a new study shows. However, one in three parents whose child reported having tasted alcohol was unaware that their youngster had done so, the researchers noted. The number of 8-to-10-year-olds who've downed a whole drink are much lower, however. "Nearly 40 percent of children aged 8 to 10 have sipped or tasted alcohol, whereas only 6 percent have ever had a drink of alcohol," corresponding author John E. Donovan, an associate professor of psychiatry and epidemiology at the University of Pittsburgh, said in a prepared statement. Previous research on alcohol use among children has focused on older children involved in heavier drinking than just a taste or sip, the researchers noted. Surveys tend to ask when a child has taken "more than a few sips," thereby excluding children who have only sampled, they said. In their study, researchers at the University of Pittsburgh and the University of Michigan conducted a phone survey with a random sample of 452 children (214 boys, 238 girls), aged 8 or 10, and their families. The researchers asked the children about their experiences sipping or tasting alcohol and their perspective on their parents' behavior and beliefs about alcohol. The researchers then interviewed the parents separately.