Fascinating. I read about this in undergrad and prompted me to read a bit more. Discovered this:

In 2014, doubt was cast over Beck and Fridlund's findings when researchers presented evidence that a boy by the name of William Barger was the real Little Albert.4 Barger was born on the same day as Merritte to a wet-nurse who worked at the same hospital as Merritte's mother. While his first name was William, he was known his entire life by his middle name, Albert.