Cabbage can potentially cause bloating in rabbits of any age, including 7-week-old rabbits. Some rabbits may be more sensitive to cabbage and other cruciferous vegetables, which can lead to gastrointestinal issues such as gas and bloating.

While cabbage is not inherently toxic to rabbits, it is considered a gas-producing vegetable. It contains compounds that can ferment in the gut and cause excess gas. In some cases, this can lead to digestive discomfort and bloating.

To prevent bloating and digestive problems, it is generally recommended to introduce new foods to rabbits gradually and in small quantities. This allows their digestive system to adjust and reduces the risk of sudden dietary changes causing gastrointestinal issues. If you want to feed cabbage to your rabbit, start with a small amount and monitor their reaction. If they show signs of bloating, gas, or other digestive discomfort, it may be best to avoid cabbage or limit its intake.

It's always a good idea to consult with a veterinarian or a rabbit-savvy professional for personalized advice on your rabbit's diet and specific dietary concerns.