Toxins get directly into the breast milk and I would not advise detox until you are over with breast feeding. Detox will have your metabolism go into your bones and fat to take out the toxins there and you do not want extra toxin into your system at the moment.
The order I favor is colon first - kidneys second and liver last. It is also wise to do another Colon Cleanse afterwards, simply because the detox process has your metabolism send the toxins into the colon for elimination and you want them out. If your body is really toxic, you will need another round of colon, kidneys and liver cleanses.