I think the debate is still out as to whether or not S. haddoni (and other species of Stichodactyla) reproduce via budding/pedal laceration. Your nem could've been injured and healed in a manner where it appears to have a "baby" so I wouldn't call it one, unless it actually drops off and forms a new nem.
Here's a link to the sticky about pedal laceration:
http://reefcentral.com/forums/showthread.php?t=1942967
Keep in mind that the thread quickly morphs into a treatment debate, so you only need to read the first couple of pages.
The short story is that so little is known about reproduction with haddoni and gigantea anemones, and it's only been within the past 10 years or so that more than a handful of carpet anemones have survived long enough in captivity to show any signs of reproduction. Only one person that I know of has gigantea that have had eggs and eventually babies.