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Kim Kardashian, Kanye West

AKM-GSI

UPDATE: E! News has obtained the birth certificate for baby Saint West. The newest Kardashian-West family member was born Dec. 5 at 6:13 a.m. PST at a Los Angeles hospital. And yes, there is no middle name listed on the official document. 

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No need to wait on monogrammed baby gifts, dolls: The mystery of Saint West's middle name has been solved!

Kim Kardashian and Kanye West's little boy actually doesn't have a middle name, a family source tells E! News. So just like big sister North West, Saint has only a first and last name.

Both mom and baby, who was delivered Saturday morning at Cedars-Sinai Hospital in L.A., are home now. Kim undoubtedly has her hands full now as a mother of two, but a source tells E! News she's "recovering and doing well" with Kanye by her side.

Kim Kardashian, North West

Dunkin D/WCP/FAMEFLYNET PICTURES

Saint's big sister Nori, 2, has been looking forward to meeting her baby brother for a while now. "We talk about baby brother all the time," Kim told E! News exclusively during her final days of pregnancy. "She's so sweet and yesterday she said, 'Mommy, can I give baby brother a kiss on your tummy?' and she kissed my stomach. She's super sweet. She has a hard time when I hold other babies but she's been getting a little bit better and I'm hoping that with her brother it's a whole new experience."

Definitely, and North can totally get some advice from her cousin/BFF Penelope Disick, 3, who welcomed a baby brother of her own last year. Yes, it's hard to believe, but Kourtney Kardashian and Scott Disick's son Reign Disick will celebrate his first birthday on Dec. 14! This is a very special day in the Kardashian family because it's also Mason Disick's birthday—he'll be turning the big 0-6!

Penelope Disick, North West

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The whole Kardashian-Jenner-Disick-West gang has lot to be happy about these days.

For much more on baby Kim, Kanye and baby Saint, tune in to E! News tonight at 7 and 11 p.m.

Plus, catch an all-new Keeping Up With the Kardashians this Sunday at 9 p.m., only on E!

—Additional reporting by Baker Machado 

(Originally published Dec. 8, 2015 at 12:35 p.m. PST)