If you suspect he/she is much younger than 8 weeks old, I would go to a rabbit-knowledgeable veterinarian soon so they can give you a professional opinion, and if needed, provide information on what the diet should be (i.e. Should the rabbit still be on some sort of milk?). It is a possible your rabbit is a runt, which is the smallest baby of a litter, due to positioning in the uterus I believe (?; unconfirmed). Wick is a runt, and at 8 weeks old, he was reportedly half the size of the rest of his litter mates.
Orange pee is natural, and it can be on and off. Wick would have the occasional orange pee, but I’d say since he’s been 1 year old (currently 1.5 years old), his pee is consistently orange. It’s uncommon for it to be clear or yellow nowadays.
Wick’s vet describes the yellow to orange color variation in pee with a tea-bag reference. Just like steeping a tea bag in water, what the rabbit consumes and it’s own biological characteristics can change color expression.
I would not be concerned, but be on guard if you ever notice it looks more brown (potentially dried blood) or has an odd consistency.
The answers provided in this discussion are for general guideline purposes only. The information is not intended to diagnose or treat your pet. Seek the advice of your veterinarian or a qualified behaviorist.