Because BG often spawn several times a year it is common to see many different sizes out of the same year class. I have seen them from fry to 5 inches in the same year class the next Jan.

I think Cecil has the rest well answered. Cecil said " Keep in mind if these are the first fish in the pond you could actually get better growth than this." I will add that being the first fish in the pond the bigger BG will try to spawn ASAP at 3 to 4 inches.