; and (B) child development, trauma, and the manner in which trauma affects the health and behavior of children; and (2) require U.S. Customs and Border Protection personnel, not less frequently than annually, to undertake continuing training on— (A) identifying and responding to common signs and symptoms of medical distress in children; (B) best practices with respect to the guidelines developed under subsection (a); and (C) changes in the legal authorities, policies, and procedures described in paragraph (1)(A). (c) Qualified resources (1) In general In accordance with subsection (d), the Secretary shall provide resources and staff, including child welfare professionals, who are adequately trained and qualified to address the needs of children at each port of entry and Border Patrol station. (2) Sufficient staffing The Secretary shall ensure that sufficient qualified child welfare professionals and qualified experts in pediatric medicine are available at each port of entry and Border Patrol station to accomplish the duties described in this section without prolonging the time children and apprehended parents and legal guardians remain in the custody of the Commissioner. (3) Child welfare expertise The Secretary, in consultation with the Secretary of Health and Human Services, shall hire, or seek to enter into contracts with, independent child welfare professionals in order to do the following: (A) To provide child welfare expertise on-site on a full-time basis at any port of entry or Border Patrol station that has had not fewer than 25 children in custody— (i) on any day during the preceding fiscal year