Dr Ong Chengsi is a principal dietitian and dietitian-researcher specialising in the clinical areas of preterm nutrition and nutrition in critically ill children. Her research interests include methods of body composition analysis, and the role of breastmilk nutrients on growth and body composition in infants and children.

• BS Nutrition and Dietetics (USA) 2007
• MS Nutrition and Public Health (USA) 2009
• PhD Yong Loo Lin School of Medicine, National University of Singapore 2020

• Enhanced versus standard fortification of pasteurized donor human milk for growth in very low birth weight infants: A randomized controlled trial. Ong C, Wong AA, Wong ST, Zheng Y, Pang CPC, Jayagobi PA, Yeo JG, Yeo KT, Chua MC. Front. Nutr 2025.
• Development and validation of a novel self-assessment tool for breastfeeding mothers. Ong C, Loy SL, Pang C, Lee S, Krishnan S, Tan JT, Chan D, Ku CW, Chan JKY, Yap F, Chua MC Int Breastfeed J, 20(1), 25.
• Food Accessibility and Nutritional Outcomes Among Food-Insecure Pregnant Women in Singapore. Lim EJK, Ong C, Said Abdul Rashid NS, Lee JJ-M, Chew J, Chua MC Nutrients. 2025; 17(5):835.
• Development and psychometric validation of a clinical instrument for infant feeding and lifestyle evaluation. Chan D, Lin J, Zheng RT, Ong C, Ku CW, Loo BKG, Chan JKY, Chua MC, Yap F, Loy SL. JPGN, 11 Feb 2025.
• Perceptions and acceptance of COVID-19 vaccine among pregnant and lactating women in Singapore: a pre-vaccine rollout cross-sectional study. Jayagobi PA, Ong C, Yeo KT, Lim CCW, Seet MJ, Kwek LK, Ku CW, Chan JKY, Mathur M, Chua MC.  Singapore Med J 65(9):p 494-501, September 2024.
• Changes in global nutrition practices in critically ill children and the impact of emerging evidence: a secondary analysis of the Pediatric International Nutrition Studies (PINS), 2009-2018. Akhondi-Asl A, Ariagno K, Fluckiger L, Jotterand Chaparro C, Martinez EE, Moreno YMF, Ong C, Skillman HE, Tume L, Mehta NM, Bechard LJ. J Acad Nutr Diet. 2024 Apr 26:S2212-2672(24)00203-X.
• Strain-resolved metagenomic analysis of the gut as a reservoir for bloodstream infection pathogens among premature infants in Singapore. Heston SM, Lim CSE, Ong C, Chua MC, Kelly MS, Yeo KT. Gut Pathogens. 16 Nov 2023.
• Addressing milk kinship in milk banking: experience from Singapore's first donor human milk bank. Jayagobi PA, Ong C, Pang PCC, Wong AA, Wong ST, Chua MC. Singapore Med J. 2022 Feb 24. doi:10.11622/smedj.2022031. Epub ahead of print. PMID: 35196845.
• Neutralizing Activity and SARS-CoV-2 Vaccine mRNA Persistence in Serum and Breastmilk After BNT162b2 Vaccination in Lactating Women. Yeo, KT, Chia WN, Tan CW, Ong C, Yeo JG, Zhang J, Poh SL, Lim AJM, Sim KHZ, Sutamam N, Chua CJH, Albani S, Wang LF and Chua MC (2021). Front Immunol 12: 783975.
• Nutritional Intake in Children with Septic Shock: A Retrospective Single-Center Study. Kirk AHP, Ong C, Wong JJ, Loh SW, Mok YH and Lee JH. J Pediatr Intensive Care. September 2021.
• High Burden of Acquired Morbidity in Survivors of Pediatric Acute Respiratory Distress Syndrome. Loh SW, Gan MY, Wong JJ, Ong C, Mok YH and Lee JH (2021). Pediatr Pulmonol
• Muscle weakness and wasting in pediatric critical illness. Ong C, Lee JH, Puthucheary ZA. Pediatr Med. 2021;4:13.
• A narrative review of skeletal muscle atrophy in critically ill children: pathogenesis and chronic sequelae. Ong C, Lee JH, Leow MKS, Puthucheary ZA. Transl Pediatr. 2021 Oct;10(10): 2763-2777.
• A cross-sectional study of the clinical metrics of functional status tools in pediatric critical illness. Ong C, Lee JH, Yang L, Wong JJM, Leow MKS, Puthucheary ZA. Pediatric Critical Care Medicine. 2021 Oct 1;22(10):879-888.
• Skeletal muscle changes, function and health related quality of life in survivors of pediatric critical illness. Ong C, Lee JH, Wong JJM, Leow MKS, Puthucheary ZA. Crit Care Med. 2021 Sep 1;49(9):1547-1557.
• Association between admission body mass index and outcomes in critically ill children: A systematic review and meta-analysis. Toh S, Ong C, Sultana R, Kirk AHP, Koh, JC, Lee JH. Clinical Nutrition. 2021 40 (5):2772-2783.
• Implementation of a nutrition screening tool to improve nutritional status of children with cancer in Singapore’s largest pediatric hospital. Han WM, Koo JYS, Lim YY, Iyer P, Ong C, Tong JWK, Chan MY. BMJ Open Quality 2021;10:e000944.
• Reassessing the Use of Proton Pump Inhibitors and Histamine-2 Antagonists in Critically Ill Children: A Systematic Review and Meta-Analysis. Yao DWJ*, Ong C*, Eales NM, Sultana R, Wong JJM, Lee JH. The Journal of Pediatrics. January 2021, 228:164-176. *contributed equally to the paper.
• Prediction of Acquired Morbidity Using Illness Severity Indices in Pediatric Intensive Care Patients. Senna S*, Ong C*, Wong JJM, Allen JCJ, Sultana R, Lee JH. Pediatric Critical Care Medicine. June 2020 Online ahead of print. *contributed equally to the paper.
• Nutritional Status, Intake and Outcomes in Critically Ill Children with Bronchiolitis. Ng GYH*, Ong C*, Wong JJM, Teoh OH, Sultana R, Mok YH, Lee JH. Pediatric Pulmonology. Feb 2020:1-8. *contributed equally to the paper.
• Use of an Electronic Feeds Calorie Calculator in the Pediatric Intensive Care Unit. Sng QW, Ong C, Ang SLL, Kirk AHP, Lee JH. Pediatric Quality and Safety. Jan 2020;5(1):e249.
• The Impact of Pre-operative Nutritional Status on Outcomes Following Congenital Heart Surgery. Lim CYS, Lim JKB, Moorakonda RB, Ong C, Mok YH, Allen JC, Wong JJ, Tan TH, Lee JH. Front Pediatr 2019;23(7):429.
• Body composition and acquired functional impairment in surivors of pediatric critical illness. Ong C, Lee JH, Senna S, Chia AZH, Wong JJM, Fortier MV, Leow MKS, Puthucheary ZA. Crit Care Med. 2019 47(6):e445-453.
• Long-Term Morbidities in Children with Critical Illness: Gaps and opportunities. Senna S, Ong C, Ng ZM, Lee JH. Ann Acad Med Singapore 2018;47:291-337.
• Nutritional practices and adequacy in children supported on extracorporeal membrane oxygenation. Ong C, Mok YH, Tan ZH, Lim CYS, Ang B, Tan TH, Loh YJ, Chan YH, Lee JH. Clinical Nutrition ESPEN. 2018;26:21-26.
• Protein Provision in the critically ill child: is less more? Ong C, Lee JH.  Lancet Respiratory Medicine. 2017;5(6):458-459
• Nutritional support of critically ill adults and children with acute respiratory distress syndrome: A clinical review. Loi M, Wang J, Ong C, Lee JH. Clinical Nutrition ESPEN. 2017;19:1-8.
• Skeletal Muscle Ultrasonography in Nutrition and Functional Outcome Assessment of Critically Ill Children: Experience and Insights From Pediatric Disease and Adult Critical Care Studies. Ong C, Lee JH, Leow MKS, Puthucheary ZA. J Parenter Enteral Nutr. 2017 Sep 41(7): 1091-1099.
• Functional Outcomes and Physical Impairments in Pediatric Critical Care Survivors: A Scoping Review. Ong C, Lee JH, Leow MKS, Puthucheary ZA. Pediatric Critical Care Medicine. 2016;17(5): e247-e259.
• Survey of contemporary feeding practices in critically ill children in the Asia-Pacific and the Middle East. Wong JJM, Ong CS, Han WM, Mehta NM, Lee JH. Asia Pac J Clin Nutr. 2016;25(1):118-125.
• Nutrition Support for Children Undergoing Congenital Heart Surgeries A Narrative Review.Wong, JJ, Cheifetz, IM, Ong, C, Nakao, M, & Lee, JH World Journal for Pediatric and Congenital Heart Surgery. 2015;6(3), 443-454.
• Nutrition biomarkers and clinical outcomes in critically ill children: A critical appraisal of the literature. Ong C, Han WM, Wong JJ, Lee JH. Clin Nutr. 2014 Apr 33:191-197.
• Protocol-driven enteral nutrition in critically ill children: a systematic review. Wong JJ, Ong C, Han WM, Lee JH. J Parenter Enteral Nutr. 2014 Jan-Feb;38(1):29-39.
• Evidence for Low Residue Diet in the Management of Gastrointestinal Related Conditions. Ong CS, Ong C, Han WM.  Proceedings of Singapore Healthcare. 2012;21(3):172-178