Will my breast shrink and be less firm after i wean my child?

No: For most women this is not a major problem. Remember by nursing your baby you are doing something to make your baby healthier....And you....Women who nurse lower their risk for breast cancer.

Yes: The texture of the breast does change after pregnancy and nursing and is unlikely to be as "perky" as before pregnancy. But most women adapt well to their body changes since having a baby is truly a transformational event that ushers in a new stage of life. The joys of "mothering" your baby more than make up for the body changes.