You can help yourself with this and prevent plugged ducts caused by changes in your breast milk due to pregnancy hormones by massaging your breasts to ensure your ducts empty completely while your child is nursing. (natural-parenting-advice.com)
Some women swear by lecithin for preventing plugged ducts. (pumpables.co)
A well fitting bra can make your (now heavier) breasts more comfortable, help prevent plugged ducts and make getting baby settled and latched on to the breast faster and easier too. (mommyedition.com)