The new mother from rural Vermont noticed that her toddler's behavior didn't seem to fit the descriptions in the child-rearing books. Her daughter would burst into tears when she heard a loud noise or if she wore scratchy clothes. She always demanded to be carried by her mother and never left alone.
The mother worried that there might be something wrong. Then she came across a book that described what psychologists increasingly call "the highly sensitive child."
"The description fit perfectly. It helped me to realize that things are going to be a little different with her and I need to accept that," she said.
Sensitive children are keen observers of the world, but tend to get overstimulated. They often live intense inner lives and are highly creative, but they are wary of new situations and of people they don't know.
They also easily intuit the moods of others. This empathy draws their peers and sometimes even adults to confide in sensitive children. Later in life, they often go into helping professions like health care and counseling.
Roughly 1 in 5 children are highly sensitive, according to the research psychologist Elaine Aron, whose 1996 book "The Highly Sensitive Person" popularized the term.
Sensitivity is an inborn temperament, she says, that comes hard-wired and remains with people for their whole lives. Michael Pluess, a professor of developmental psychology at Queen Mary University of London, has found that our life experiences, particularly those early in life, also have a big impact.
"We found that about 50 percent of differences in sensitivity between people are due to genetic factors, the other half by environment, including the prenatal environment," Pluess said.