I am currently breastfeeding and plan to continue until my son is one year old. I am constantly being told that my breast size after I finish breastfeeding will be smaller than before I became pregnant. Common sense tells me that this makes no sense. Breast size is of concern for most women and practically everyone I know thinks their breasts are either too big or too small. This attitude helps me feel good about how I look no matter what stage of lactation I am in.
Real breasts change to meet the needs of children as a normal part of life.
It appears that what you have been told is true for many women. A good friend of mine gave birth to twin girls when her son was only 12 months old. She nursed the twins and toddler until she gradually weaned when the twins were over 2 years old. Sharing my breastfeeding experiences with friends who also enjoy breastfeeding has helped me gain a healthy attitude towards my own breasts. I hope you will have supportive friends and family on your journey through motherhood.