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Work published in the Economic Journal, however, debunks that particular idea. In “Daughters and Divorce”, Jan Kabatek of the University of Melbourne and David Ribar of Georgia State University, in Atlanta, confirm that having a female first-born does indeed increase the risk of that child’s parents divorcing, in both America and the Netherlands. But, unlike previous work, their study also looked at the effect of the girl’s age. It found that “daughter-divorce” risk emerges only in a first-born girl’s teenage years (see chart). Before they reach the age of 12, daughters are no more linked to couples splitting up than sons are. “If fathers were really more likely to take off because they preferred sons, surely they wouldn’t wait 13 years to do so,” reasons Dr Kabatek. Instead, he argues, the fact that the risk is so age-specific requires a different explanation, namely that parents quarrel more over the upbringing of teenage daughters than of teenage sons.
Taken over the years, the daughter effect, though real, is small. In the Netherlands, by the time their first-born is 18, 20.12% of couples will have divorced if that child is a son, compared with 20.48% if she is a daughter—an increase in probability of 1.8%. But in the five years when the firstborn is between the ages of 13 and 18, that increase goes up to 5%. And it peaks, at 9%, when the child is 15. In America, for which the data the researchers collected were sparser than those in the Netherlands, the numbers are roughly double this.