This information has been taken from the Infant Feeding Survey 2000 and can be found at http://www.doh.gov.uk/infantfeeding/publications.htm
The reasons women give for stopping breastfeeding vary depending on what stage they stop. Mothers who stopped breastfeeding within the first two weeks tended to give reasons such as that the baby rejected the breast, or that they had painful nipples/breasts or that they were worried that they didn’t have enough milk. The vast majority of mothers (90%) who gave up breastfeeding before 6 weeks wished they had been able to breastfeed for longer. Among mothers who breastfed for longer than 4 months, returning to work was the major reason for stopping breastfeeding.
Breastfeeding mothers were more likely to report problems with feeding their babies than mothers who bottle-fed (32% vs 13%). However, the main problem reported by breastfeeding mothers once breastfeeding was established was difficulty in getting their baby to take a bottle. Mothers who bottle-fed tended to be more concerned that their baby was unsatisfied after a feed, or about illness, vomiting or colic than mothers who breastfed.