I am 47 youngest child 11 had partial hysterctomy and just been diagainosed with infection in breast due to childbirth. How is this possible?

That . That is an unusual situation. It is very rare for women who are not breastfeeding to get a breast infection ("mastitis"). I would like to be sure that you have had a mammogram and complete breast assessment. Please recheck with your physician and see if you need a mammogram or other breast testing to rule out something more serious. There are some conditions that can look like a breast infection but are more serious, such as a malignancy.