RT Book, Section A1 Lanpher, Brendan A1 Lichter-Konecki, Uta A1 Summar, Marshall A1 Batshaw, Mark L. A2 Stevenson, David K. A2 Cohen, Ronald S. A2 Sunshine, Philip SR Print(0) ID 1109796849 T1 Neonatal Hyperammonemia T2 Neonatology: Clinical Practice and Procedures YR 2015 FD 2015 PB McGraw-Hill Education PP New York, NY SN 9780071763769 LK accesspediatrics.mhmedical.com/content.aspx?aid=1109796849 RD 2024/04/24 AB The most common concern for neonates who present with poor feeding, tachypnea, hypothermia, and lethargy during the first days of life is sepsis; in fact, this is the most likely cause of severe illness. However, it is important to also consider the possibility of an inborn error of metabolism. Although individually these are rare disorders, as a group they probably are present in more than 1 in 5000 live births1; if they are not identified early, most die or are left with severe brain damage.