I did not lose any weight after having 1st baby. Cant breastfeed but can I pump to lose weight after 2nd?

Pumping is healthy. I am not sure that pumping will result in weight loss for you but it will certainly be healthy for your child! the real question is why you did not lose any weight after the first. If you have a metabolic issue or Insulin resistance then pumping may not help. I suggest you see both your physician and a chinese medicine practitioner to assess what may be blocking losing weight.