You can watch a clip below:
In the clip, which aired during this week's episode of The Kardashians, Kendall and Khloe can be seen baby shopping for their younger sister Kylie.
While walking around the store, Kendall, 26, comments on how different it feels, telling Khloe that "the day is coming for me".
She said: "Being in a baby store feels real for me these days."
And when Khloe questioned what she meant, Kendall added: "Just like the day is coming for me, you know."
Kendall later added that being 26 makes it feel "more real" for her.
The chat came a few weeks after mum Kris Jenner tried to convince Kendall to consider freezing her eggs.
After watching Kourtney and her partner Travis Barker struggle with fertility difficulties, Kris felt compelled to prevent her younger daughters from a similar fate.
You can watch the moment below:
In the clip, Kris says: "Your eggs, the count goes down a little bit," before ringing the family OBGYN, Dr Thais Aliabadi, who explains: "For Kendall, if she has a partner, if they're not married, I'd usually recommend at least a cycle of egg freezing. It would be a good time to freeze eggs. Listen, the younger you are, the better the quality."
Currently, Kendall is dating NBA player Devin Booker. The couple first confirmed their relationship back in February 2021, and while he has not been as heavily featured in the family reality show as other partners, the pair appear to be joined at the hip.
Kendall is also an aunt to many nieces and nephews - Kourtney and Scott's kids: Mason, 12, Penelope, nine and Reign, seven. Meanwhile Kim has daughters North, eight and Chicago, four, and sons Saint, six, and Psalm, three.
Rob Kardashian shares five-year-old daughter Dream with his ex partner Blac Chyna, while Khloe Kardashian is mum to True, four, and Kylie Jenner is mum to Stormi, also four, and her newborn son whose name has not yet been announced.
In other Kardashian news, viewers were left devastated for Khloe Kardashian this week after watching her discover Tristan Thompson's latest betrayal.
The drama begins to unfold towards the end of the episode when cameras rush to Kim Kardashian's home gym at 6.30am.
"Only important s**t happens before 7.30," says one member of the camera crew.
You can read more on this here.
A new episode of The Kardashians drops every Thursday on Disney+.