twins born at 37 weeks weight?

Multiple Birth Gestation and Birth Weight Data
A report issued by the National Vital Statistics Report in 2018 revealed some interesting data about twins, triplets, and other multiples and how they stack up against singleton births. The numbers make it clear that multiples are born earlier and smaller, weighing less
what is the average time between twins being born?

Multiple gestation: time interval between delivery of the first and second twins
W F Rayburn, J P Lavin Jr, M Miodovnik, M W Varner
PMID: 6700896
Abstract
A clinical investigation was undertaken to challenge the commonly accepted view that the interval between the birth of the first and