Everyone said stuff about this except it was "when it hatches there is no chick you get extra life". Now that has changed! When it hatches a chick comes out and you keep feeding it when it is hungry. To feed press space if there is a bird icon on the mini map. If you feed it enough it will grow up. Return to your nest and the adult chick will fly away. THEN you get an extra life. Sometimes someone else's chick grows up and you still get a life... it's weird!
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press space on the nest
Press A on the egg to make it hatch faster!
You can refresh the page a lot of times,then it will hatch.
There isn't a way to make it hatch fast, but the best way is to put the egg first in your party. It doesn't walk with you, the Pokemon who you put 2nd in the party will but it's a pretty fast way to hatch an egg though.
Just randomly ride around like with any other egg. After you have taken enough steps the egg will hatch. It will take 10k-10.5k steps to hatch it