The ‘reinstatement’ of children within the planning discourse reflects a scholarly and professional recognition of the interdependencies between urban space and critical health issues of specific social groups (Gleeson & Sipe, 2006). This research paper interrogates the international policy concept of child-friendly cities, defined as “any system of local governance committed to fulfilling child rights as articulated in the Convention on the Rights of the Child. It is a city or community where the voices, needs, priorities and rights of children are an integral part of public policies, programmes and decisions” (UNICEF, 2018: 10). It considers the conceptual limitation of the policy concept when children’s ability to survive, grow and thrive are increasingly threatened by extreme weather events and environmental degradation. The research paper looks specifically at the urban challenges faced by mega-delta cities in Asia (e.g. Bangkok, Dhaka, Hanoi, Ho Chi Minh City, Kolkata, Shenzhen, Yangon) where children make up a sizeable demographic group. Utilizing the uneven spatial development of Dhaka, Bangladesh (Ganges-Brahmaputra Delta) as case study, the paper explores how the conceptual limitation of CFCs shapes its implementation gaps. Lastly, this research paper considers the long-term impact of the COVID-19 pandemic on children living in the mega-deltas cities of Asia.