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I read somewhere that the fawn Zebra Finch was a sex linked colour. Does that mean my fawn babies are all female? Out of my eleven babies there only seems to be 3 males. But there are 3 fawns - could any of these be male?

Sex linked means that the color gene is carried on the sex chromosone of the bird.
What color are the parents? If they both look 'normal' and you're getting fawn chicks, then the male is split to fawn and the chicks are hens.

Thanks for that. I did see some pictures of male fawns. Trouble is all the babies hatched together and I'm not sure who had who. The adults are:
grey male/white female
grey male/white female
grey male/fawn female
By grey, I mean the normal zebra finch colour.
The chicks seem to be: 2 grey males, 1 black face male, 3 fawn hens, 4 grey with a lot of white hens and 1 all white (hen?). How do you tell the sex of all white birds?

You won't know whether you have male or female fawn until they're old enough to sex. As with the grey zebras, the beak of the male will be a darker orange or red......same for the white zebras.

You won't know which males are spilt to fawn unless you separate the pairs into separate cages and let them breed. All males from the fawn female would be split to fawn, but if she's paired with a male that is split to fawn you will get both female and male fawns.

This link may explain everything better http://www.zbirds.com/Colors.html
Scroll down until you see 'color notes' and just substitute Fawn for CFW to see the possible ratios of colors.

You need to be careful if your birds are inbreeding. If they're all related you should probably remove the nests................