Helsley was placed on the paternity list Friday.
Helsley hasn't pitched since he delivered a scoreless frame Tuesday against the Rockies, and he'll now step away from the team for a few days to be with his family. He should rejoin the Cardinals for Monday's series opener against the Cubs. Giovanny Gallegos is the likely candidate to fill in for any save chances this weekend in Arizona, though the team hasn't officially named a fill-in closer.