In comparing all IVF singletons (n = 11/ 347) with singletons in the general population, they found significantly higher rates for: pre-term between 28 weeks and 37 weeks; low birth weight and very low birth weight (AOR between 1.1 and 1.7) amongst the IVF singletons. It is thought that the eSET singleton pregnancies may have better obstetric outcomes as the selected embryo may be of better quality.