Are you able to tell to tell the sex of a goldfish that is less than 2 months old?

Answers:
On some fish it is easier then others. Take a look at the vent (where the poo comes out), if it looks like it's sticking out a little big then it is probably a female, if it looks more flat then it is probably a male.

Here is a site with pics, http://www.bristol-aquarists.org.uk/gold.

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1. Does it really matter?
2. Why do you need to know?

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With goldfish it is nearly impossible to tell the sex even when they are adults. Sometimes during breeding season males develop growths on their heads. Apart from that there is no other way to tell the sex of goldfish.

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no, you will have to wait until it gets a little bigger and older