A lot of cats who are born all white will gradually change color as they mature. My 3 year old (originally all white) now has brown stripes and looks more like a brown tabby with white legs, and another one (also originally all white) is developing cream marble stripes which is turning orangey as she matures.
If it turns out that your cat is changing colour due to genetics, please do not be dissapointed. I personally enjoy seeing the development of their colour over the years as it really can be very fascinating!
