This chapter offers a comprehensive understanding of the legal frameworks governing child maintenance in two EU countries—Slovenia and Lithuania. It takes a comparative approach to examine case law related to child maintenance payments, aiming to uncover common trends and specific practices between the two distinct European legal systems. The chapter begins by defining the concept of child maintenance in the two countries and then moves to explore the various criteria essential for determining child maintenance amounts, emphasising the child’s needs and the financial situation of the parents. The research further investigates specific issues associated with child maintenance, such as the implications of shared child care, the effects of late maintenance payment requests, and the nuances of supporting children with physical or mental disabilities.