Does this Doctor know that the MC includes taking a laxative?
It's fairly common knowledge that if a lactating mother takes a laxative it will give the baby diahrea.
If there was even the smallest of chances of passing >any< toxins to you baby whetther it's because of slight dehydration or the specific toxic state of a person, whatevever. Why in the world would you chance it when you could do the MC at a later date?
Why in the world would you >>knowingly<< want to give your baby anything but the most nutritionaly complete breast milk ,whether it's their main source of nutrition or not, at this most important stage of their development?
"Want to loose weight???? Concentrate on healthy meals and exercise. Two things YOU and YOUR BABY will benefit from......"