Or well past graduate school, these days

Babies’ crying extends longer than previously thought.

Typically referred to as the "cry curve," parents might expect their infants to cry radically less after the initial peak. However, a new study from Denmark, challenges this "cry curve" pattern, by pooling data from parents in 17 different countries. 

"We've created two mathematical models that reasonably represent the available data. Neither of them show that the duration of crying falls so markedly after five weeks, which is what is otherwise seen in the graphs that are presented to parents. The available data shows that crying is still a significant part of many infants' repertoire after six months," says Christine Parsons, who is an associate professor at the Department of Clinical Medicine at Aarhus University.

No mention of how long majoring in victimhood studies prolongs the crying curve, but probably decades.