Yes, the YMCA West Seattle has children care for infants through 5 years of age, they were great! We did the part-time mornings but they do have part time afternoons and all day care available, whatever fits your schedule.
Here is a web link to them! If you have problems with the web link working, just type YMCA West Seattle on your web browser and on the homepage of YMCA select Youth and there is a link to chidcare.
http://www.seattleymca.org/page.cfm?ID=youthPrograms&catID=6