I voted for lack of support from family, friends etc. I was lucky in that I educated myself about breastfeeding and had a supportive husband. I also had two close friends (who unfortunately lived many hours away!) but were breastfeeding when I started to feed Marnie. I was often told that I didn't have enough milk or How did I know how much she was getting with each feed? I was also told that I wouldn't be able to continue if I returned to work - I did and introduced my work place to breastfeeding mother's rights.
Mothers of the past have a lot of influence on new mums and perhaps they are the ones who need the education? I currently have a friend now who breastfeeds but is too embaressed to breastfeed in public and expresses for each feed?????? This alarms me - where is the stigma coming from?