November 08, 2015 03:00 PM

With her Jan. 7 due date fast approaching, Sister Wives‘s Robyn Brown can’t wait any longer to find out the sex of her baby.

“I want you to tell me,” she tells her ultrasound technician in an exclusive clip from Sunday’s episode. “We want to know today. Like I’m about to die I want to know so bad.”

But before she finds out the big news, her husband Kody gives it his best guess in the clip, by looking closely at the image.

“Can you let us try and figure it out?” he asks. “I want to try.”

With four wives and a combined 18 children, he has had plenty of practice.

“I knew with Truly. It felt like I knew with Solomon and I feel like I know now,” he says in the clip. “I think I know the gender of the baby.”

To find out if the Sister Wives stars are having a boy or girl, watch Sunday’s episode at 9 p.m. (ET) on TLC.

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