Blac Chyna is getting intimate about putting on baby weight.

The 28-year-old model is expecting a child with fiancé Rob Kardashian, and she took to Snapchat on Saturday to give her followers an update on her pregnancy.

WATCH: Kim Kardashian Gushes Rob Will Be a 'Great Dad'

In one of the videos, Chyna steps on a digital scale while chatting with her 3-year-old son, King Cairo, whom she shares with her ex-fiance, Tyga (aka Kylie Jenner's ex-boyfriend).

As the numbers start to appear on the scale, revealing a weight of 163.2 pounds, her voice heightens as she shouts, "Uh oh, Mommy gained 20 pounds!"

WATCH: Kris Jenner Is 'Thrilled' About Blac Chyna's Pregnancy

In another video, Chyna snuggles up to a curious King Cairo, who starts asking his mom about her growing belly.

"Is it a boy or girl?" he asks, to which his mom replies, "I don't know. What do you want it to be?"

Another adorable moment occurs between the mother-son duo when King Cairo asks, "Am I squishing the baby?"

WATCH: Blac Chyna Flaunts Her Growing Baby Bump in Figure-Hugging Jumpsuit

While Chyna will soon be a mother of two, this marks the first child for Kardashian, 29. The two announced the exciting baby news earlier this month via Instagram, just one month after they became engaged.

Since then, Chyna hasn't been shy about showing off her baby bump in public. To hear what she had to say in response to haters calling her "fat" and "disgusting," watch the video below.