That isn't a baby spoon, it is a salt spoon. Upscale table settings had a small bowl called a "salt cellar" at every place at the table and each cellar held salt and a salt spoon. Nobody had to do anything as mundane as pass the salt since everyone had their own. These were popular in the early 1900s. I collected these little spoons for a while years ago, in fact they became so collectable that there were repros being made. Their collecting popularity has since faded but I still think they are a cool relic of genteel ways in the old days.