Head Start is income based and there are a few other considerations.  I'm including a reference article which describes the criteria needed and where to go to find head start in your area.
 
http://www.education.com/reference/article/Ref_Does_Child_Early/
 
The next link connects to local head start programs.
 
http://eclkc.ohs.acf.hhs.gov/hslc/HeadStartOffices
 
Good luck,
Rachna

Hi, In addition to the info previously provided, you may also want to review the Preschool Readiness info center on Education.com. In it, you'll find a variety of information on potty training, separation anxiety, early childhood development, and more!
 
http://www.education.com/topic/preschool-readiness/
  
You can also learn more about the Early Head Start program on the Early Head Start National Resource Center website here:
http://www.ehsnrc.org/
  
Good luck - I hope you are able to a find a great Early Head Start program for your child in your area.