Background: Urinary incontinence and low back pain are often present during pregnancy and after childbirth. The aim of this study was to examine the relationship between the number of children with the occurrence of urinary incontinence and low back pain after pregnancy in the Greek population. Materials and Methods: Seventy-one Greek women (M = 35.0 age, SD = ±4.3) with specific inclusion criteria completed just once the International Consultation on Incontinence Questionnaire and the Oswestry Disability Questionnaire after five years from childbirth. Results: A total of 28.2% of the participating women experienced urinary incontinence, and 38% experienced low back pain after pregnancy. No relationship has been found between urinary incontinence and the number of births (r = 0.062, p = 0.609) and low back pain with the number of births (r = −0.076, p = 0.529). Statistically significant correlations were found between urinary incontinence and low back pain (r = 0.33, p < 0.01) and the urinary incontinence and the maternal age at first delivery (r = −0.264, p = 0.026) in women who underwent a vaginal delivery in second birth had fewer urinary incontinence symptoms and increased low back pain. Conclusions: Few correlations emerged in the present study. Future research is necessary to be conducted to examine the relationship between postpartum women’s demographic data, urinary incontinence, and low back pain.