Are cauliflowers and brocollis already safe to be consumed by a 6-month-old?

I've also read in an article before that broccoli can cause cholic among babies. But some say you just have to always steam and cook it thoroughly. As regards microwaving broccoli, some studies have shown that microwaving broccoli causes it to loose nutrients. Broccoli may also be baked in casseroles and other recipes. Here are some great broccoli recipes for babies: http://wholesomebabyfood.momtastic.com/broccolibabyfoodrecipes.htm