Thermal trauma is one of the most severe and most frequent injuries, causing significant mortality in the pediatric population. One of the elements of modern burn therapy is proper fluid therapy. The Parkland rule, well-known to doctors, paramedics and nurses, used to estimate the supply of fluids in a patient injured as a result of a burn, was designed for adults and its use in the pediatric population may lead to serious consequences in the form of excessive fluid overload (the so-called fluid creep). Underestimating the volume of infused fluids leads to the development of shock and renal failure. Properly conducted fluid therapy should be carried out on the basis of the burn area, child’s weight and factors determining the increase or reduction of fluid supply according to used formula (coexisting injuries, inhalation trauma, etc.).