Im not being ignorant, i know some women cannot b/f not only for personal reasons (going back to work, involving DH etc, etc) but for medical reasons too - what are these???

. I suppose i could google reasons why, but i would rather hear from you ladies...
i got into a heated discussion with DH MIL about breastfeeding. SHe claimed she simply couldnt - when i asked why, she said she had no milk.....
Do all birthing women have the potential to b/f ??? Do all pregnant woman produce colostrum? Why didnt she have any milk ? could it have been latching probs etc.....

I have b/f both my children to 8 mths and 12 mths respectively, and i intend to do the same for #3. Im intriged, that 'i didnt have any milk 'was her answer............... when i asked why, she said there wasnt any......WHY???