Just one week after the birth of Rob Kardashian's first child, his sister Kylie Jenner is experiencing serious baby fever — and Khloé Kardashian has reportedly urged the 19-year-old to get pregnant with boyfriend Tyga right now!

“Khloé has encouraged Kylie to not wait too long before she begins a family,” a source tells Hollywood Life. “While all of Kylie‘s sisters have mixed views about Kylie having a child with Tyga, Khloé has advised young Kylie to start a family asap!”

MUST SEE: Kylie Jenner Cuddles With Tyga's Son King on Snapchat — Watch!

The beauty mogul loves the idea of being a "sexy, young mom," and Khloé "feels that Kylie is far more mature than any other young woman her age… if she has found someone she wants to have children with, then why wait," the source adds.

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And Tyga, who has a four-year-old son with Rob's fiancé Blac Chyna, is allegedly on board with the idea!

"Kylie and King have a special connection and it’s really making her think of having a kid with Tyga," a different insider previously shared. "He told her one of his greatest joys is being King's father and that he’s down to father a child with Kylie."

Scroll through the gallery below to see the young couple's cutest Instagram photos!