The Rockies placed Stephenson on the paternity list Wednesday.
Stephenson will be away from the team for 1-to-3 days while he welcomes a child into the world. The 28-year-old right-hander has been a serviceable relief arm in the middle innings for the Rockies since returning from the injured list in early August. In his 14 appearances since being activated, Stephenson has provided a 2.45 ERA and a 1.16 WHIP to go with one win and two holds.