Researchers said the broad shifts in parental behavior appear to set their latter-born children on a lower path for cognitive development and academic achievement with lasting impact on adult outcomes. First borns tend to have better job, income and higher educational background.
According to an article published in 2018 in the New York Post, a study that evaluated the oral health habits of 2,000 millennials discovered that many of them don't keep their mouths as clean as they could. The study reported that three out of 10 millennials brush their teeth once a day, and that the average millennial participating in the survey has gone more than two days in a row without brushing their teeth even once. Yet, the survey says, more than half of those polled indicated that they're worried about losing their teeth as a result of poor oral health.