As exciting as this would be, I HIGHLY DOUBT that your clams actually bred. When clams breed, they spew millions of eggs into the water column. It takes a very long time for these eggs to settle out, go through their metamorphic stage and actually become a "clam." Also, the "baby clams" have no xooanthella, so have no color at all. The only way, when bred in a tank, for the babies to obtain xooanthella, is to kill a live clam, put it in a blender, blend it up, and dump it in the water. Then, the baby clams get their xooanthella, from the blended clam.
From what I understand clams are in a free floating larval stage for about 2 weeks. IMHO it is impossible to keep them alive through this larval stage in our home aquariums for that long. Skimming, pumps, powerheads, fish premeditation, coral feeding, etc will take care of them in this larval stage. But you could be one in a gazillion and got lucky...
I agree even though I can't see anything in your pic's you probably have a spiny oyster or something similar to them, I have actually had them pop up in my tank and I have one now that is over 1".
Where's the baby i cant see sqwadiddly dont make me come over there to see it. lol......... Have seen the big clam in person and its a nice clam decent size healthy as can be. POWDER BLUE is still best thing in there IMO fish is awsome