1026_sister_single"Sister Wives" mega-dad Kody Brown is a father ... for the 17th time!

The TLC reality show star and wife #4 Robyn reportedly welcomed a baby boy in the family's Las Vegas home this morning.

Little Solomon Brown joined the rest of his massive family at 2:02am -- coming in at 9 pounds, 10.5 ounces and 22 inches long!

This is the first child for Robyn and Kody -- who married last year on the TLC reality show.

In addition to little Solomon, Kody has 16 other kids from his 3 other wives, Janelle, Christine, and Meri.

Congrats to the BIG happy family!   

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