"The scale keeps tipping because she’s giving in to her enormous appetite," dished the snitch.
An insider says Jenner, 20, "is craving junk food and candy and baby daddy Travis Scott is letting her have it."
Why? "Because she can be a nightmare to be around if she doesn’t get her way," reveals the source.
The reality star's go-to grub includes In N Out’s chili fries, cheeseburgers and strawberry shakes!
"She has someone get it for when the mood strikes."
When she gets a midnight craving for Mexican, she gets takeout from LA hotspot Casa Vega.
"She’s still in her second trimester and has a way to go yet," reveals a pal who has become increasingly worried as a "healthy" pregnancy weight gain is 25 to 35 pounds total.
As Radar has previously revealed exclusively, Jenner has been in hiding since news broke of her pregnancy because she's mortified to show off her weight gain.
“Kylie told her entire family that she is going to avoid the cameras and selfies once she starts gaining weight because she does not want her fans to see her like that,” a source close to the Keeping up with the Kardashians star said.
“She is legitimately scared over the amount weight she is going to gain and is looking into ways to make sure she gains as little as possible.”
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