I shouldn't worry about that, I freely feed mine and although he eats as though he's a very small rabbit, gobbling up plenty of pellets (definitely more than two tablespoons a day) and lots of hay, he's still a very energetic, bouncy, crazy thing.
)
One thing I wanted to ask breeders since we're on the topic, I read here:
http://www.chinchillachronicles.com/weaning_a_chinchilla.html
that chinchilla kits can overeat?
'Chinchilla kits can over eat, which is a major contributory factor to juvenile mortality and it is therefore important to not over-compensate. At the age of 8 weeks a kit should be consuming approximately ½ - ¾ tablespoons of chinchilla pellets, a small handful of good quality coarse hay and distilled water daily.'
I was pretty sceptical especially as other information on the page I knew to be problematic (I would want to wean males before twelve weeks), it didn't sound like a good idea to limit the food, especially not hay, given to a growing hindgut fermenter, but since I don't have experience with kits (would like to one day, still learning first) figured I should ask just to check.