Background: Transient tachypnea (TTN) is a common disorder of the newborn. It is characterized by the early onset of tachypnea sometimes with retractions or expiratory grunting and occasionally cyanosis that isrelieved by minimal oxygen supplementation (<40%).Objectives: To identify the risk factors and describe the clinical characteristics, treatment and outcome ofinfants with TTN.Patients and methods: This study was carried out on 100 newborn babies with birth weight of 2500 to 4000 gm and gestational ages range from (completed 37 -42 wks), who were admitted to the neonatal care unitof Children Welfare Teaching Hospital, Medical city, Baghdad, from 1st of September 2013 to the 31st ofJanuary 2014, and diagnosed as having TTN.Results: Males represented 68% and females were 32%, with a male to female ratio of 2.1:1. Fifty-threepercent aged 38 weeks, compared to 38% aged < 38 weeks and 9% > 38 weeks, indicating that therewas a significant inverse correlation between the incidence of TTN and the gestational age. There was ahighly significant inverse correlation between the neonate’s weight and the frequency of TTN. Cesareansection done in 80% compared to 20% delivered with spontaneous vaginal delivery (SVD) and neonateswho were delivered by elective section were more likely to have TTN than those delivered with SVD oremergency section. The history of maternal diabetes in (17%), a statistically significant association wasfound between TTN and the maternal Diabetes Mellitus but not with other maternal diseases. Tachypneaand chest retraction were the most frequent clinical manifestations, 93% and 72% respectively. Chest X-rayrevealed that 71% had increased pulmonary vascular markings, over aeration in 22%. Out of the 100 cases,95% were discharged after they improved without complications, 5% complicated with Pneumothorax. Nodeath in the studied group.Conclusions: There was a significant association between TTN and maternal diabetes, mode of deliveryespecially elective CS, lower gestational age (38 weeks and less), and lower body weight. The most frequentclinical manifestations of TTN are Tachypnea and chest retraction. Increased pulmonary vascular markingsand over- aeration are the most frequent radiological manifestations. TTN is a self-limited disease in mostof the cases.