Traveling Parents Screening Consistency Act of 20 21 This bill directs the Government Accountability Office to review implementation of requirements regarding screening by the Transportation Security Administration (TSA) of baby formula, breast milk, purified deionized water for infants, and juice on airlines. Specifically, the review must consider whether the TSA effectively manages consistency of screening protocol applications for formula, breast milk, purified deionized water for infants, and juice; evaluate the need for the TSA to update and revise procedures for such screening; assess whether the TSA effectively tracks passenger complaints related to such screening to monitor trends and identify inconsistencies; evaluate the TSA's communications and information sharing practices for passengers, air carriers, and airports relating to screening protocols for such screening; evaluate the TSA's policies regarding the screening of passengers with nursing products; and make recommendations for improving the TSA's overall screening practices relating to such screening.