We imagine that ultrasound technicians have seen it all when it comes to babies in utero—but how often do they hear that the child-on-the-way is "lucky 17" for the expectant couple?

On this Sunday's new episode of Sister Wives, Kody and his pregnant fourth wife, Robyn, go in to find out the sex of their first child together—a "very polarizing" issue, according to the man of the house.

Oh, not because it's kid No. 17, mind you. Just because half of the family wants a girl and the other half wants a boy.

Check out this exclusive clip in which the couple get a good look at their gestating bundle of joy and figure out how to tell the rest of the family the good news.

May we suggest an email blast?

This special one-hour episode of Sister Wives premieres Sunday at 9 p.m. on TLC.

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