Buy the 2015 Old Farmer's Almanac!
Reporting
It sounds like you haveIt sounds like you have bulbils forming. These are onion seeds. They are too tiny to plant for significant results. You could pull one up and see how big the onion is underground. (Is it big enough to use/eat?) Or cut off the bulbils and give the onions a little more time. They might grow a bit more.

2015 Garden Calendar2015 Weather Watcher's Calendar2015 Recipes Calendar2015 Engagement Calendar 2015 Everyday Calendar2015 Country CalendarNew Year Cross StitchLobster Rope Doormats