DGS was exclusively breast-fed until 5½ months. At that point his Mum and Dad decided to introduce him to a few "proper" foods. Bit of squished banana on a spoon, bit of wazzed beetroot, bit of mashed potato. All very normal.
But within about 2 weeks of them starting to do that, DGS was picking up the spoon and starting to feed himself. Not necessarily especially well, it can get a bit messy, but basically, he knows to dip the spoon in the food and then put it in his mouth. It's been a month since he started doing it and he now gets the food in most of the time. At 7 months.
I really don't mean this as a brag — DGS is a happy little baby, but he seems pretty much average on every other development measure I can think of. It's just this one thing. (He's still getting 90% of his calories from breast milk!)
I don't remember our DC doing anything like this until they were at least 1 year old. Maybe older. Plus they were not great eaters, so it was all the "just one more" and "here comes the aeroplane" stuff. Is my memory very bad, or is DGS unusual?