Baby keets start standing on their own shortly after hatching for short periods of time (they tire easily). Since they are so small and sleep most of the time when they are really young, a person really can't see them standing on their own 2 feet unless you look closely (and can see inside the nesting box/nest). Also, with full crops, they are top-heavy and can't stand for long.
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A baby giraffe can stand up after a hour after its birth
A baby goat will walk after they are born on the same day/night. It usually takes a couple of hours after birth before they stand and attempt walking.
About 3 weeks untill it grows feathers. 3-6 monthes for it to fully grow and mature, but it usually does not mate untill it is at least 1 year in age.
Short
400 days
It would be alright as long as the parakeet does not feel sick or frightened at all. If the y feel frightened then the parakeet might die.
18 days
They are not tall (they cant stand, yet). They are measure as X inches LONG.
it really depends on what type of parakeet you have and what environment they live in...they need to have a friendly and not mean mate too..
Early baby pigeons leave after about a month.
Three months