Five studies (four published as conference abstracts) evaluated growth in 10 infants diagnosed with UCDs (Table S4, n = 1 citrullinemia, n = 2 OTC deficiency, n = 2 arginase deficiency, n = 4 argininosuccinate lyase [ASL] deficiency, and n = 1 CPS1 deficiency) who were fed HM exclusively (n = 5) or combined with medical formula (n = 5). The gene discussed is CPS1; the disease is citrullinemia type I.