Every child has the right to a standard of living appropriate for his development. Parents have an obligation, depending on their abilities and material capabilities, to secure life conditions required for child's development. On the other hand, the state has a commitment to provide parents with adequate help q:J in achieving child's right to a suitable standard of living. Croatian family law requires parents to support underage and, under some circumstances, even legal age children. The aim of this research, from legal and economical point of cr.) view, is to analyse the institute of child maintenance within the Croatian law. Special emphasis is on the analysis of newest family law solutions regarding guidelines about level of child maintenance considering child's age, number of children and the pay grade of child sustainer. After detailed analysis of current legal framework and its usage in practice, this work will disclose whether the legislator goal, which is higher level of legal security and simplifying procedures of determining level of child maintenance, its increase and decrease, is achieved cc, with the latest changes in this legal area.