Interlabial masses of newborns are rare issues that fall into the interest of pediatricians, pediatric surgeons, urologists, dermatologists and gynecologists. The most common are the hymenal cysts and paraurethral gland cysts. Several interlabial masses, including those of embryological origin, ectopic tissue, prolapse, urological anomaly, or neoplasia, can superficially resemble simple cysts. These include prolapsed urethra, prolapsed ectopic ureterocele, prolapsed vagina or uterus, Gartner's duct cyst, hydrometrocolpos associated with an imperforate hymen and botryoid rhabomyosarcoma. The differential diagnosis is important both for treatment approach and for follow up. We present a 3- day- old baby girl patient diagnosed with hymenal cyst.