Jonathon Maguire

MD, FRCPC, MSc

Scientist

Biography

Dr. Jonathon Maguire is a Scientist in the Li Ka Shing Knowledge Institute of St. Michael’s Hospital and a Staff Pediatrician in the Department of Pediatrics at St. Michael’s Hospital with an active pediatric clinical practice. He is an Associate Professor of Pediatrics and Lawson Chair in Patient Engagement in Child Nutrition at the University of Toronto. His research interests focus on clinical trials involving nutrition and development in young children, as well as the creation of tools to facilitate evidence informed child health practice. He co-leads TARGet Kids!, the largest primary care research network for children in Canada. He has received a number of peer reviewed operating grants including a Canadian Institutes of Health Research Foundation Grant and a CIHR/SPOR Innovative Clinical Trials Mentorship Chair.

Recent Publications

  1. Susko, M, Korczak, DJ, Cost, KT, Charach, A, Crosbie, J, Anagnostou, E et al.. Social Skills as a Predictor of Mental Health Trajectories among Autistic Youth and Youth with ADHD during the COVID-19 Pandemic. Res Child Adolesc Psychopathol. 2025; :. doi: 10.1007/s10802-025-01365-3. PubMed PMID:41082071 .
  2. Li, X, Keown-Stoneman, CD, Omand, JA, Cost, KT, Gallagher-Mackay, K, Hove, J et al.. Screen Time and Standardized Academic Achievement Tests in Elementary School. JAMA Netw Open. 2025;8 (10):e2537092. doi: 10.1001/jamanetworkopen.2025.37092. PubMed PMID:41071548 PubMed Central PMC12514615.
  3. Borkhoff, CM, Imsirovic, H, Bayoumi, I, Macarthur, C, Nurse, KM, To, T et al.. Developmental screening at 18 months using the Nipissing District Developmental Screen. Paediatr Child Health. 2025;30 (6):477-485. doi: 10.1093/pch/pxaf023. PubMed PMID:41049705 PubMed Central PMC12495510.
  4. Kucab, MD, Keown-Stoneman, CD, Birken, CS, Perlman, M, Parsons, J, D'Annunzio, D et al.. Center-Based Childcare in Early Childhood and Nutritional Risk in Later Childhood: A Prospective Cohort Study. J Nutr. 2025; :. doi: 10.1016/j.tjnut.2025.09.028. PubMed PMID:41022151 .
  5. Borkhoff, CM, Imsirovic, H, Bayoumi, I, Macarthur, C, Nurse, KM, To, T et al.. Screening for developmental delay at 18 months using the Infant Toddler Checklist: A validation study. PLoS One. 2025;20 (6):e0326751. doi: 10.1371/journal.pone.0326751. PubMed PMID:40569996 PubMed Central PMC12200864.
  6. Qiu, K, Omand, JA, Elshaarawi, Y, Rasiah-Shaidev, S, Keown-Stoneman, C, Cohen-Silver, J et al.. School food programs and food insecurity at the REACH school network: an observational study. BMC Public Health. 2025;25 (1):2060. doi: 10.1186/s12889-025-23163-8. PubMed PMID:40462048 PubMed Central PMC12131624.
  7. Massara, P, Keown-Stoneman, CDG, Maguire, JL, Bandsma, R, Comelli, EM, Birken, CS et al.. Understanding the association of longitudinal body mass index patterns in children and their parents: A data-driven study from the TARGet Kids! cohort. Obes Res Clin Pract. 2025;19 (3):223-231. doi: 10.1016/j.orcp.2025.04.011. PubMed PMID:40335421 .
  8. Prajapati, M, Li, X, Philip, K, Keown-Stoneman, CDG, Omand, JA, Charach, A et al.. The association between learning models and child health behaviours during the COVID-19 pandemic. Prev Med Rep. 2025;54 :103071. doi: 10.1016/j.pmedr.2025.103071. PubMed PMID:40297567 PubMed Central PMC12036063.
  9. Bayoumi, I, Parkin, PC, Martin, M, Keown-Stoneman, CDG, Birken, CS, Maguire, JL et al.. Connecting Families: Poverty Screening and Financial Support Navigation for Families of Young Children in Primary Care: A Pilot Randomized Controlled Trial. Acad Pediatr. 2025;25 (5):102820. doi: 10.1016/j.acap.2025.102820. PubMed PMID:40139488 .
  10. D'Hollander, CJ, McCredie, VA, Uleryk, EM, Kucab, M, Le, RM, Hayosh, O et al.. Breastfeeding Support Provided by Lactation Consultants: A Systematic Review and Meta-Analysis. JAMA Pediatr. 2025;179 (5):508-520. doi: 10.1001/jamapediatrics.2024.6810. PubMed PMID:40029627 PubMed Central PMC11877411.
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Affiliations & Other Activities

  • Staff Pediatrician, Department of Pediatrics, St. Michael’s Hospital
  • Associate Professor, Department of Pediatrics, University of Toronto