NEW YORK — In almost any adoption, the new parents accept that their good fortune arises out of the hardship of the child's first parents. The equation is usually tempered by the thought the birthparents either are no longer alive or chose to give the child a better life than they could provide.

On Aug. 5, The New York Times published a front-page article from China that contained chilling news for many adoptive parents: Government officials in Hunan Province, in southern China, had seized babies from their parents and sold them into what the article called "a lucrative black market in children."

The news, the latest in a slow trickle of reports describing child abduction and trafficking in China, swept through the tight communities of families who have adopted children from China. For some, it raised a nightmarish question: What if my child had been taken forcibly from her parents?

And from that question tumble others: What can or should adoptive parents do? Try to find the birthparents? And if they could, what then?

Scott Mayer, who with his wife adopted a girl from southern China in 2007, said the article's implications hit him head on. "I couldn't really think straight," Mayer said. His daughter, Keshi, is 5 years old and is a mainstay of his life as a husband and a father.

Like many adoptive parents, Mayer can recount the emotionally exhausting process he and his wife went through to get their daughter, and can describe the home they have striven to provide. They had been assured that she, like thousands of other Chinese girls, was abandoned in secret by her birthparents, left in a public place with a note stating her date of birth.

But as he started to read about the Hunan cases, he said, doubts flooded in.

According to the State Department, 64,043 Chinese children were adopted in the U.S. between 1999 and 2010, far more than from any other country. Child abduction and trafficking have plagued other international-adoption programs, notably in Vietnam and Romania, and some have shut down to stop the black-market trade.

But many parents saw China as the cleanest of international adoption choices. Its population-control policy, which limited many families to one child, drove couples to abandon subsequent children or to give up daughters in hopes of bearing sons to inherit their property and take care of them in old age. China had what adoptive parents in America wanted: a supply of healthy children in need of families.

"Adoption is bittersweet," said Susan Soon-Keum Cox, vice president for public policy and external affairs at Holt International, a Christian adoption agency based in Eugene, Ore., with an extensive program in China. The process connects birthparents, child and adoptive parents in an unequal relationship in which each party has different needs and different leverage. It begins in loss.

Most parents contacted for this article declined to comment or agreed to speak only on the condition of anonymity. Several said they never discussed trafficking, even with other adoptive parents.

Agencies say that cases of child abduction are few compared with the number of abandoned Chinese babies who found good homes in America. The abductions reported in August were of 16 or more children taken from their parents between 1999 and 2006.

According to the investigation, population-control officials threatened towering fines for couples who violated the one-child policy because they were too young to be married or already had a child, or because they had themselves adopted the child without proper paperwork. When the parents could not pay, the officials seized the children and sent them into the lucrative foreign adoption system.

A 2010 State Department report said there were "no reliable estimates" of the number of kidnappings for adoption in China, but cited Chinese news media reports that said the figure might be as high as 20,000 children a year, most of whom are adopted illegally within the country, especially boys.

But it is hard to know, said David Smolin, a professor at the Cumberland School of Law at Samford University in Birmingham, Ala., who has written extensively about international adoption and trafficking. Changes in China in the early 2000s — a rising standard of living, an easing of restrictions on adoption within the country, more sex-selective abortion — meant that fewer families abandoned healthy babies, Smolin said.

"Orphanages had gotten used to getting money for international adoption," he said, "and all of the sudden they didn't have healthy baby girls unless they competed with traffickers for them."

Mayer, in Montclair, has accepted he may never know the full truth about his daughter's beginnings.

"I can't change the past or change whatever anybody has done in China," Mayer said. "What's most important to me is there are real significant issues for my daughter coming of age and understanding her birth story. And I'm committed to supporting her in that and making sure that it's as honest and truthful and supportive as possible. And that's a scary thing."