This study assesses differences in children's independent mobility and outdoor play time between two urban informal housing settlements within India's in-situ slum redevelopment policy. This redevelopment policy involves replacement of existing slum housing with new apartment-style structures at the original site. One of the settlements under study has undergone redevelopment, while the other remains on the waitlist for redevelopment. Additionally, the study explores potential gender-based variations in independent mobility and outdoor play time, shedding light on the distinct effects of redevelopment on boys and girls. Questionnaires were administered to mothers, addressing aspects such as independent mobility licenses, the range of independent mobility, the age at which mobility licenses are granted, and the duration of outdoor play of children. Findings show that children in slum settlement were reported to have more mobility licenses, broader independent mobility range, and earlier licenses than children in redeveloped settlement. Gender differences are evident, with girls in redeveloped settlement receiving mobility licenses later than both boys and girls in slum settlement, but boys' age at which they received independent mobility licenses remained consistent regardless of their place of residence. Boys in the redeveloped settlement engage in more outdoor play time than boys and girls in slum settlement. Conversely, girls in slum settlement participate in more outdoor play time than those in redeveloped settlement. These findings have important implications for slum redevelopment policies, highlighting the need to consider morphological aspects of residential environments that support girls' outdoor play time and independent mobility. It is crucial that these considerations be integrated into the design of redeveloped settlements to ensure equitable development of children in such communities.