Hey Judy I don't know to much about Cresties although I recommend then to everyone who wants a simple friendly cute little critter in they're house however I found this site here thats got a great breeding topic post enjoy.

Crested geckos are prolific breeders, generally producing between 10-20 clutches a year of two eggs each. The number of clutches depends on a variety of factors including: the age of the female, the quality of the diet, and most importantly, temperature. In fact, the only way to get this geckos to stop breeding is to lower the cage temperature to between 50-60 degrees F for a few months and reduce the amount of food offered. Crested geckos are generally sexually mature at about 8 months, but I have found that females of at least 12 months of age are more reliable breeders and produce larger clutches with a greater percentage of fertile eggs. Crested geckos are difficult to sex as babies, but as they mature, the males develop a LARGE hemipenal pouch under the base of the tail and are easily distinguished from females that lack this appendage. This bulge becomes very noticeable about 4-6 months of age. A cycling period is recommended to promote breeding, 3-4 months with a cage temperature of 50-60 degrees seems to work well for me. After the cooling period, the daytime high should be allowed to reach into the 80's and the nighttime low can drop into the low 70's or high 60's. Increasing misting at this time may also promote breeding activity. It is not easy to distinguish developing eggs in the abdomens of gravid female crested geckos like it is in other gecko species such as leopard geckos. However, gravid females do exhibit a slight bulge in the lower abdomen prior to oviposition, but you have to look carefully. Oviposition occurs in loose, moist substrate on the floor of the cage. In my enclosures, I provide one section that is a mixture of peat moss and vermiculite which is kept moist at all times. Other breeders have found that crested geckos will utilize open containers of moist loose substrates. Eggs can be incubated from 70-80 degrees F, but temperatures above 82 degrees should be avoided for extended periods. Babies hatch between 65-80 days, depending upon temperature. Babies are small but hardy and do well housed in small aquariums (5 to 10gal) with screen lids. Babies will eat after the first shed (sometimes before depending upon the individual) and should be offered small crickets and baby food.
Heres the link
http://www.kingsnake.com/rockymounta...RMHcrested.htm
Andrew