To hatch an egg, you need to get views on it. You have a time limit of 7 days. If you don't get enough hits in these 7 days the egg will die. I recommond the following DragCave click sites: http://www.sotidragon.net/index.php http://dragonnery.info http://greg-kennedy.com/dragcave/index.html http://www.eggswillbedragons.com
Put your eggs on all 4 sites to get a good amount of views. Don't forget to be generous and spare sometime to click eggs on those sites as people do for yours. Also, you can leave the pages open and they auto-refresh so you can give views while doing something else.
Hope this helps!