The objective of the study was to establish the relationships of litter size and pig weight at birth on survival at weaning and weaning weights in nursing pigs. The study consisted of 10,898 pigs from 1,020 litters.The data suggested that uterine space might have been an important factor in litter sizes of 14 or more. There was an inverse relationship between litter size and average piglet birth weight. For each additional pig born in a litter, the average birth weight decreased by 0.083 lb. The data indicated in litters of 9 or more the stillborns tended to be the smaller ones, whereas in small litters of 7 or more pigs, stillborns tend to be the larger ones. The number of pigs weaned per litter was closely related to the number of live pigs born per litter. The relationship was not linear as litter size at birth increased, litter size at weaning also increased but at a diminishing rate. This was most likely due to the fact that cross fostering was not allowed. Average pig weaning weight was inversely related to litter size at birth and at weaning. For each extra pig weaned per litter, there was a decrease in average pig weaning weight of 0.288 lb. For every 0.1 lb extra at birth there was a 0.193 lb increase in weaning weight.The overall survival rate was 84.9%. For a 1.0 lb pig the survival rate was only 12%, but if the pig weighed 3.5 lbs the survival was 92-98%SVC Comments: 1) Pig birthweight is important for survivability (>3.5 lbs. 92-98%). The late term gestating sow needs to have her feed increased to a