Young mothers frequently complain of backaches. The aim of this paper is to reveal if there is any relationship between physical activity in their early years (aged 6-18 years) and in adulthood, and between current physical activity and back pain. The paper is based on empirical research carried out by the survey method. With the help of structured sampling, 336 young mothers, all within 1-3 years after giving birth and all of whom were from the V4 countries and Romania, were included in the study. Their early and present physical activities, as well as their back pain in the upper and lower part of the back, was examined. Data were collected by questionnaire. To process the data, SPSS.17 was used. The results show that young mothers who were the most physically active in their early years remained the most active as adults. The correlation between the young mothers’ sporting activity in the early years (aged 6-18 years) and adulthood is strong. Due to their activity, the most physically active young mothers have less upper and lower back pain. The connection between current sporting activity and back pain were also significant both by the upper and the lower part of the back. It is concluded that regular physical activity in childhood is often continued and make up part of a young women’s life. As a result, they bear the early period of motherhood fitter and with fewer backaches.