A 37-week gestation female neonatal infant presented with lower abdominal distension. Ultrasonography showed a hydrocolpos, measuring 8.3 cm x 6.9 cm x 6.1 cm in size and on perineal examination, vaginal atresia was noticed. On a follow-up ultrasonography performed 41 days after aspiration, the hydrocolpos was enlarged to 10 cm x 8 cm x 7 cm in size, and compressed adjacent small bowel significantly with concomitant bilateral hydronephrosis. Temporary tubed vaginostomy was carried out with the provision of excellent drainage and easy access for contrast studies to outline the pathologic anatomy. We are planning to perform vaginal reconstructive surgery on her age around 2 years, when her vaginal structure might grow sufficiently for reconstructive surgery.