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Size of seedling isn't a good indicator. Most of us grow hybrids, which can express themselves in a variety of ways.
Sativa dominant strains grow different than indica dominants, yet you can get both expressions from one seed batch.
Have heard of some folks using more nitrogen during veg to induce femaleness, but haven't tried this and am doubtful. If you feed a child more, does it change sex...?
Perhaps someday there will be a hormone spray we can use to gurantee females, but as far as I know, the only thing like that is Gibrellic Acid, to induce male flowers. (seed feminizing)
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