It should be fine as long as your lo do not have jaundice or other complications. My first baby suffer from jaundice and I'm advise by the hospital to stop taking the confinement tonics I bought from hockhua as the unknown herbs may be causing it. My second baby do not have any problems and I'm taking the tonics.
Have friends who bought their prepacked soup. I think you can check with the people in the store. But I would think that it is fine as all my friends had some form of tonic soup and don't think their breastfeeding was affected by the herbs. That being said, best to check with the experts in the shop! :)
I suggest you consult a TCM physician before consuming