Neonatal respiratory morbidity in twins versus singletons after elective prelabor caesarean section.

To compare the rate of neonatal respiratory morbidity in singletons versus twins delivered by pre-labour caesarean section.Uncomplicated pregnancies delivered by prelabor caesarean section at 34+0 to 37+6 weeks' gestation were retrospectively selected. For both singletons and twins caesarean delivery was undertaken electively only after amniocentesis and if the lecithin/sphingomyelin ratio was ≥2. Neonatal respiratory morbidity was compared in twins versus singletons.241 singletons and 100 twin neonates were included. Overall neonatal respiratory morbidity was comparable between the two groups (25/241 (11.7\%) versus 7/100 (7\%), p=.331). Between 34+0 and 36+6 weeks, however, the risk was higher among singleton than twins (15/46 (32.6\%) versus 6/72 (8.3\%), p<.001). At multiple regression, dichorionicity, gestational age at delivery ≥37 weeks and female sex independently decreased the risk of neonatal respiratory morbidity.The risk of neonatal respiratory morbidity after elective caesarean section seems lower among twins, especially prior to 37+0 weeks.