I had 5 children and breastfed most of them until they were 3 years old. The oldest pretty much refused anything but the breast until he was 12 months old. He was the chubbiest of all my babies. I used to get a few unfavourable comments but I assured people that I'm sure he would be over it before he was a teenager! He stopped at aged 3 when I was pregnant with my next child. He's now 21 years old and very healthy. I understand it can be difficult for women who have to work in jobs that don't support breastfeeding and expressing is not as effective as a baby's suck. If you do need to express it is important to express as frequently as you would feed or your milk supply will decrease and there is an increased chance of engorgement and developing mastitis