In Part Four of our longer project documentary "How Moms Matter To Weddell Seal Pups" the focus is on what project scientists are learning about Weddell pup birth timing during the pupping season. Are pups better off if they're born in the early part of the season, late in the season, or somewhere in the middle? How do differences in Weddell moms affect the time in the season when the pup is likely to be born? Turns out that the time during the season when a pup is born, and the age and experience of that pup's mom, can affect the pup's likelihood of survival to adulthood to have a pup of her own.