Isaiah Courage Bates was born on October 16, 2004, to Gil Bates and Kelly Jo Callaham. He was the couple's fourteenth child, and they went on to have five more children after him.
Isaiah is currently homeschooled. He is being brought up as an active participant of the Institute in Basic Life Principles.
Isaiah makes up the "Three Musketeers" with his brothers Jackson and Isaiah. The three love going on wild adventures. He's said to be a sweet child, and is constantly showering his sisters with compliments. He is tender-hearted and lovable.
Isaiah appeared on the TLC show 19 Kids and Counting many times as a child. In 2012, TLC aired one season of the show United Bates of America, which focused on Isaiah's family. In 2015, UpTV began airing a similar show, Bringing Up Bates, which is currently in its sixth season. Isaiah is regularly featured in both shows.
Isaiah has been involved in the following weddings:
- groomsman: his brother Zach Bates's wedding to Whitney Perkins (12/14/13)
- usher: his sister Josie Bates's wedding to Kelton Balka (10/5/18)
- usher: his sister Carlin Bates's wedding to Evan Stewart (5/25/19) 
- groomsman: his brother Lawson Bates's wedding to Tiffany Espensen (5/12/22)