Study published in The Journal of Urology, Volume 169, Issue 6, Pages 2332-2334 (June 2003). Doctors at a clinic reviewed their experience in treating patients with a trapped penis due to phimosis following newborn circumcision. The infants were circumcised with a Gomco device. Fifteen of 521 circumcised boys (2.9%) developed phimosis after circumcision.  Three boys had recurrence of phimosis after treatment. The authors concluded, "Phimosis with a trapped penis is an infrequent but important complication of circumcision."