In wild at India the mother Indian Blue peahen is the teacher and she make her chicks to learn to fly, because there are jungle cats, tigers, Asian lions, Indian wolves, wild dogs, Asian bears, eagles, hawks which will eat the peachicks that refused to fly.
Mother nature ensure the peachicks are able to fly strongly at 7 days and able to climb the trees via branches, at their first day, etc 5-7 hours old, so they roost on higher branch, with mother peahen.
They growing the juvenile flight feathers and don't start to moult the innermost juvenile primary 1st until 4 weeks old.
Mother peahens are very carefully birds, because of dangerous meat-eating mammals, and when chicks are 2 weeks old, they are capable of fly upward to 8 feet, to branches.
The chicks have juvenile plumage they have at hatching day and immature plumage they will moult at 1 month old and the plumages are dull and similar to plumages of mother peahens, until 6 month-old when they moult to lst adult plumage, the moult goes slowly until completed at 18 month-old.
Peafowls are prey birds and they are fast to fly away from tigers. The trains of 1 & 2 years old peacocks, are shorter until about 26 month old which is likely age of shedding the short train & replace with new adult 100-180 c.m. train.
Clinton.