Kylie Jenner mentions postpartum depression: "I cried constantly."

In a brand-new teaser for "The Kardashians," Kylie Jenner alludes to her experience with postnatal depression 

In the Hulu teaser unveiled on Monday, the reality television star tells her sister Kendall Jenner that she knows 

Later in the teaser, the beauty mogul, who welcomed a baby son in February, admits that she is "very upset with [her] sister," 

Kendall, on the other hand, seems to be furious with Kylie since she claims that Kylie "cancelled last minute" on a promise 

1. The "Staying Current With the Kardashians" alum admitted that even after having baby No. 2, 

whose name she has not yet revealed, she experienced "mental, physical, and spiritual" difficulties.