The first three years of life are a significant period of growth
  for all children. Children develop at different rates and in
  different ways.  Differences in development may be related
  to personality, temperament and/or experiences.  Some
  children may also have health needs that affect their
  development.  While all children grow and develop at
  their own rate, some infants and toddlers experience delays
  in their development.  This can be a cause for
  concern. 
  What is Early Intervention?
  Early intervention services are intended to enhance the growth
  and development of a child and are planned and delivered through
  a partnership between families and professionals.
  California’s early intervention program is called California
  Early Start. The program, Part C of the Individuals with
  Disabilities Education Act (IDEA) is a federal grant program that
  assists states in operating a comprehensive statewide program of
  early intervention services for infants and toddlers with
  disabilities, ages birth through age 2 years, and their families.
  Child Find
  Child Find is intended to locate and identify children who are
  experiencing or are at risk of experiencing developmental delays
  of 25% or more, are considered at risk or have an established
  risk condition as defined in the California Early Intervention
  Services Act. Child Find System and Referrals IDEA Part C
  regulations require that each State must have a statewide
  comprehensive, coordinated, multidisciplinary interagency system
  to provide early intervention services for infants and toddlers
  with disabilities and their families. The system should include
  standards for appropriate identification, timelines, and
  coordination with primary referral sources, including the Early
  Hearing Detection and Intervention program.
  You can review the Child Find Plan and 
  Early Start Local Performance Materials.