Among U.S. Census Bureau surveys, the Survey of Income and Program Participation (SIPP) is the only data source that captures changes in children’s living arrangements at a monthly level. Given the SIPP’s panel structure, up to 4 years of monthly data will be available for these children with future data releases. This SIPP brief offers estimates of the timing and nature of transitions in the presence of parents or a parent’s partner during calendar year 2017 for children under the age of 18 at the time of the interview.