You really can't go by color with the little ones, as they change weekly while growing. I have some very colorful little aquaflame girls about a month or so old. Best thign to do is to turn the baby over and get a close up of the vent area for us and we will be able to tell .

Or you can look at vent area and then look at some huge sexing photos I have on my site that explains.

Pretty baby too
SEXING COLLAREDS

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PHEve / Eve