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/ Source: TODAY
By Ree Hines

Kylie Jenner is the latest member of the "Keeping Up With the Kardashians" family to welcome a baby to the world, but another new arrival made an appearance in a video she shared Sunday.

After announcing the birth of her daughter — and confirming her pregnancy at the very same time — Jenner posted a YouTube clip showing the time leading up to her happy news.

There were messages from friends, glimpses of sonograms, family gatherings and one blink-and-you'd-miss-it moment featuring Jenner's big sister Kim Kardashian holding her own bundle of joy, 3-week old Chicago West. (See Chicago at the 8:26 mark!)

Meet Chicago West!Youtube

Kardashian and husband Kanye West celebrated the arrival of their third child, via gestational carrier, on Jan. 15. Four days later, they revealed Chicago's name.

Now fans of the family finally get a look at the little one.

Mother and baby: Kim Kardashian and 3-week-old daughter Chicago West make and appearance in Kylie Jenner's pregnancy video.Youtube

Chi has two siblings back home — sister North, 4, and brother Saint, 2.

But she'll have two other playmates even closer to her age — her cousins, including Kylie's new daughter and Khloe Kardashian's baby-to-be, who's due in the spring.