Babies come in all shapes and sizes and this study looked at how this affected their odds of death and illness. Compared with babies who were an average size for their gestational age (AGA) babies who were small for their gestational age (SGA) had a higher risk of dying. For babies who were large for their gestational age (LGA) risk went down if they were born between 25 and 27 weeks but increased if they were born between 28 and 31 weeks. The risk of illness went up for SGA babies born between 28 and 38 weeks but decreased for LGA infants born before 37 weeks.
You can read the abstract of this article here.