You can check the measurement with a ruler. Yes, their skulls will increase in size, so they could eventually be kept in the cage you have. It's between 4 - 6 months old that they will reach a size large enough for a larger spaced cage if they are destined to be large enough.
For babies, small adult males, and most any adult female, you don't want spacing any wider than 1/2 inch.
For full grown large males, 1 inch spacing should be sufficient.
A cage with 1/2 inch spacing will be more expensive than a cage with 1 inch spacing, because there is more wire in the product. Something many people do is purchase hardware cloth and zip ties from their local hardware store. With a small wire cutter you can cut the cloth to size and then wrap and zip tie it to your cage to turn it into a 1/2 inch bar cage cheaply.
Hanging out in the Land of New Feetsies:
Melon, Skinner, Black Pete, Zanna, Custard, Tucker, Jeffrey, Zmei, and Windham.
Last edited by Storyseeker; 05-04-2011 at 04:51 PM.