每个州决定其机构的哪个部门来监督c部分，16个州的指定机构是卫生部门，11个州是教育部门。剩下的23个州选择了国家卫生和公共服务部的监督。在伊利诺斯州，对儿童早期干预(EI)项目的服务由伊利诺斯州人类服务部(DHS)监督。家庭通过当地的儿童和家庭连接(CFC)办公室访问EI服务，在那里他们被指派一名服务协调员。与伊利诺斯州国土安全部(Illinois DHS EI)项目达成协议的个人服务提供者和机构提供者，被用来向儿童提供直接服务，并支持家庭。在过去十年中，美国经历了需要特殊教育服务的儿童数量的增加。这一增长也在一些项目中得到了观察，这些项目满足了婴儿和学步儿童在早期干预伞下的想法的一部分的需求。在过去的5年里，伊利诺斯州从出生到3岁的儿童的转介和服务的数量有所增加。根据伊利诺斯州DHS数据表1所示，2005年至2009年期间，在伊利诺斯州的想法部分C项下的儿童接受服务的支出和数量都有所增加。2009年，有18,883名婴儿和3岁以下的幼儿提供服务。儿童的控制这比2005年的16647名婴幼儿提供的服务增加了14.4%。
Each state determines which of its agencies is to oversee Part C. The designated agency in 16 of the states is the health department, and in 11 of the states it is the departments of education. The remaining 23 states have opted for a combination of oversight by the states' health and human services departments. In Illinois, services to children in early intervention (EI) programs are overseen by the Illinois Department of Human Services (DHS). Families access EI services through a local Child and Family Connections (CFC) office where they are assigned a Service Coordinator. Individual service providers and agency providers who have provider agreements with Illinois DHS EI programs are used to provide direct services to children and supports to families. Speech therapy and developmental therapy, which address a child's individual deficits in meeting identified developmental milestones, are the services most frequently provided to children .In the past decade, the United States experienced an increase in the numbers of children requiring special education services. This increase is also observed in the programs which address the needs of infants and toddlers served under Part C of IDEA under the early intervention umbrella. Over the past five years, there has been an increase in the number of referrals and services provided to children from birth to 3 in Illinois. As indicated by Illinois DHS data in Table 1, there was an increase in the expenditures and the in the number of children receiving services under IDEA Part C in Illinois from 2005 to 2009. In 2009, services were provided to 18,883 infants and toddlers under the age of 3. This was an increase of 14.4% from the 16,647 infants and toddlers provided services in 2005.