Adopting a baby or toddler is much more difficult than it was a few decades ago. Of the nearly 4 million American children who are born each year, only about 18,000 are voluntarily relinquished for adoption. Though the statistics are unreliable, some estimates suggest that dozens of couples are now waiting to adopt each available baby. Since the mid-1970s—the end of the so-called baby-scoop era, when large numbers of unmarried women placed their children for adoption—the percentage of never-married women who relinquish their infants has declined from nearly 9 percent to less than 1 percent.