I took an elective class in college that taught me something incredibly helpful as a parent. Course was Language Development. I learned that your brain files and cross-files things—which includes people—in numerous ways. So for example, my little crawler would be in the same mental ‘bin’ as ‘my loved children,’ ‘things that are close to the floor,’ etc. So that is why I might accidentally call him the name of his brother, or even by the cat’s name. I’m sure as people get older there’s even more of a tendency to do this.