Today, one in five American families has only just one child. That’s twice as many as there were just 30 years ago. The reason is multifaceted, but one of the most compelling arguments to why mothers are stopping after their firstborn is the cost aspect. No one wants to place a price tag on a child, but for families with an income of $60,000 a year, each child costs more than $250,000 by the time he or she turns 18, according to the U.S. Department of Labor. That’s not counting college tuition, which has grown exponentially since our parent’s generation. "Twenty percent of the family population is one child," said Psychologist Susan Newman, author of the book Parenting an Only Child. "In the major metropolitan cities, like New York and Los