Here is what I found on the first item of a search:
Teachers must at minimum have an Associate Degree in Early Childhood Education (ECE); OR
Baccalaureate or Advanced Degree in Early Childhood Education (ECE); OR
Associate, Baccalaureate or Advanced Degree in a field related to early childhood education and coursework equivalent to a major relating to early childhood education, with experience teaching preschool-age children. (see below **)
Additionally current teachers must have a minimum of 15 hrs of classroom focused training annually (per program year).
Bachelor’s degree requirement to hit Head Start next year
By: Rebecca Harris / December 21, 2012
Starting in fall 2013, Head Start and Early Head Start lead teachers in community agencies around the city will have to have bachelor’s degrees in early childhood education. The city expects that 14 percent won’t meet the requirement, and could potentially lose their jobs or be demoted.