Occasional Weekday Sitter For 5 Month Old

My husband and I are looking for occasional weekday sitters for our 5-month-old son when he is sick or if there is daycare closure. We are looking for someone who does not mind being with our son when he has a fever, cough, runny nose etc. We are looking for someone who can be on call and has weekday availability. The hours would be ideally be 8-6 p.m. or as many hours as you can provide given the likely short notice. Thank you!