All governments aim to ensure better health and nutrition to children. The Rajasthan state (India) has implemented a unique frontline coordination model where Accredited Health Social Activist (ASHA) Sahyoginis are expected to support two other frontline workers (FLWs) i.e. the Anganwadi Workers from the Integrated Child Development Services and the Auxiliary Nurse Midwives from the Health department to improve child health. This thesis focuses on examining the existing coordination between the three groups of FLWs in Rajasthan by exploring FLWs' participation in child immunisation and Vitamin A supplementation (two common activities), service coverage and beneficiary's' knowledge (expected outcomes), and the challenges faced and areas that need improvement for better frontline coordination. A mixed methods design was used. Sixteen villages from two blocks (tribal and non-tribal) of Udaipur district (Rajasthan) were selected using multistage purposive sampling. The formative stage included 12 FLWs' in-depth interviews (IDIs) as well as a review of FLWs' job descriptions to understand the process and government expectations on their participation in routine childhood immunisation, polio camps, routine Vitamin A supplementation and Vitamin A campaigns. The next stage included data collection from the 16 selected villages i.e. structured questionnaire survey of FLWs (46), observations of Maternal and Child Health and Nutrition Day (16), review of FLWs' immunisation and Vitamin A registers (32) and a structured questionnaire survey of registered infants' mothers (321)-all to ascertain the actual participation of FLWs in these four activities and the outcomes. IDIs with FLWs (46) and FLWs' line managers (17) were conducted to understand their experience, issues and solutions for better frontline coordination. The participation of FLWs in three of the four activities (except Polio Camps) was found to be limited. The FLWs and their line managers were also dissatisfied with coordination between FLWs. Poor outcomes also indicated unsatisfactory coordination. Overall, frontline participation and outcomes were better in tribal than non-tribal villages. A variety of factors (i.e. personal, professional, organisational, and geo-socio-cultural) appeared to affect coordination between FLWs. Appropriate recruitment, training, monitoring and supervision and rewards to the FLWs along with greater political commitment for coordinated approached and addressing intra-departmental challenges are proposed to improve frontline coordination and child health in Rajasthan.