Sepsis puerperalis is caused by genital tract infection in the first two weeks after childbirth. It was common in the past, but today, with the use of antibiotics and antiseptics, it has become very rare. If you have high temperature shortly after childbirth, your doctor may suspect you have sepsis puerperalis.
There is a low risk that infection, if it is not immediately discovered and treated, will spread to the bloodstream causing blood poisoning (puerperal sepsis), or in the uterus and ovarian tube (in which case it will cause infertility).
As the physician excludes the possibility of any other infection as a cause of elevated temperature, he will send vaginal smear and urine sample to the laboratory for analysis. After that, you will get an antibiotic to prevent spread of infection.