ABSTRACT Introduction Every child deserves the right to life. In Nigeria like other African countries, a high burden of child mortality prevails. Attaining a low-mortality rate of children entails that mothers who are the primary caregivers are in the best position to provide quality healthcare management. Method With the phenomenological approach in qualitative research, the researchers sourced data using Focus Group Discussions (FGDs) and In-Depth Interviews (IDI) from 38 mothers of various categories. The participants were purposively selected from four government and mission health institutions in a semi-urban Nsukka town, Enugu State. Data were analyzed thematically. Findings Results revealed that mothers utilize health institutions including government, mission, private, pharmacies and patent medicine vendors when seeking healthcare for their children. Their inability to recognize potential life-threatening conditions is the leading factor in increasing child mortality. Findings show that because participants were concerned about financial challenges; they were ready to adopt traditional medicine as an alternative to modern medicine. The study showed evidence of unsafe strategies mothers adopt for the health management of their under-five children with common illnesses. Participants indicated little knowledge of social workers’ engagement in health institutions. Conclusion Healthy living is essential in the protection from illnesses. Since under-five children are vulnerable to illnesses, their mothers should provide them with quality healthcare management. The study recommends that social workers’ engagement with health providers and users in semi-urban societies could help propagate healthcare awareness and strategies in mothers’ choice of health management for under-five children in Nigeria. Overall, adequate health policy consideration should be given to all under-five children in Nigeria.