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What kind of baby? If you are talking about cockatiels I think the earliest mine hatched was at 19 days, but I have had very limited experience as I am not a breeder. 18 - 21 days is standard but I am sure some have had early hatches.
Canaries hatch and fledge within ten days! My tiels hatched anywhere from 20 to 24 days after the eggs were laid. They are the only ones I have ever bred.