To learn more about early numeracy, take a look at these resources:
High Five Mathematize  An Early Head Start and Head Start Math Resource Guide
Learning and Teaching with Learning Trajectories  Early Math – Birth to Grade 3
Mathematica  Developing Math Skills in Early Childhood
National Association for the Education of Young Children  Math
Too Small to Fail  Letâ€™s Talk About Math
Zero to Three  Early Math and Science

 Cardinality
 is the concept that, when counting objects, the last number represents the total number of objects in the set
 Measurement
 includes size, length, height, weight, volume, distance, and time
 Number and operations
 refers to a set of math concepts related to understanding and representing numbers and operations (e.g., addition, subtraction, multiplication, and division) and the relationships between them
 Numeracy
 is the ability to understand and reason with numbers
 Onetoone correspondence
 refers to matching one object to each number word when counting
 Subitizing
 refers to the ability to identify the number of objects in a small group of objects without counting them
 Scaffolding
 is offering the right level of support to help a child achieve more than they would be able to on their own