Jonathon Maguire




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. Deveci, AC, Keown-Stoneman, CDG, Maguire, JL, O'Connor, DL, Anderson, LN, Dennis, CL et al.. Paternal BMI in the preconception period, and the association with child zBMI. Int J Obes (Lond). 2023; :. doi: 10.1038/s41366-023-01261-0. PubMed PMID:36737513 .
  2. Deveci, AC, Keown-Stoneman, CDG, Maguire, JL, O'Connor, DL, Anderson, LN, Dennis, CL et al.. Maternal BMI in the preconception period, and association with child zBMI growth rates. Pediatr Obes. 2022; :e12999. doi: 10.1111/ijpo.12999. PubMed PMID:36573480 .
  3. Gingoyon, A, Borkhoff, CM, Koroshegyi, C, Mamak, E, Birken, CS, Maguire, JL et al.. Chronic Iron Deficiency and Cognitive Function in Early Childhood. Pediatrics. 2022;150 (6):. doi: 10.1542/peds.2021-055926. PubMed PMID:36412051 .
  4. Nurse, KM, Janus, M, Birken, CS, Keown-Stoneman, CDG, Omand, JA, Maguire, JL et al.. Predictive Validity of the Infant Toddler Checklist in Primary Care at the 18-month Visit and School Readiness at 4 to 6 Years. Acad Pediatr. 2022; :. doi: 10.1016/j.acap.2022.09.004. PubMed PMID:36122830 .
  5. Borkhoff, CM, Atalla, M, Bayoumi, I, Birken, CS, Maguire, JL, Parkin, PC et al.. Predictive validity of the Infant Toddler Checklist in primary care at the 18-month visit and developmental diagnosis at 3-5 years: a prospective cohort study. BMJ Paediatr Open. 2022;6 (1):. doi: 10.1136/bmjpo-2022-001524. PubMed PMID:36053584 PubMed Central PMC9234802.
  6. Wu, LC, Hattangadi, N, Keown-Stoneman, CDG, Maguire, JL, Birken, CS, Stremler, R et al.. Sleep Duration and Internalizing Symptoms in Children. J Can Acad Child Adolesc Psychiatry. 2022;31 (3):115-123. . PubMed PMID:35919906 PubMed Central PMC9275369.
  7. South, CA, Keown-Stoneman, CDG, Birken, CS, Malik, VS, Zlotkin, SH, Maguire, JL et al.. Underweight in the First 2 Years of Life and Growth in Later Childhood. JAMA Netw Open. 2022;5 (7):e2224417. doi: 10.1001/jamanetworkopen.2022.24417. PubMed PMID:35904782 PubMed Central PMC9338407.
  8. Omand, JA, Li, X, Keown-Stoneman, CDG, Borkhoff, CM, Duku, E, Lebovic, G et al.. Body Weight at Age Four Years and Readiness to Start School: A Prospective Cohort Study. Child Obes. 2022; :. doi: 10.1089/chi.2022.0018. PubMed PMID:35834646 .
  9. Yoshida-Montezuma, Y, Sivapathasundaram, B, Brown, HK, Keown-Stoneman, C, de Souza, RJ, To, T et al.. Association of Late Preterm Birth and Size for Gestational Age With Cardiometabolic Risk in Childhood. JAMA Netw Open. 2022;5 (5):e2214379. doi: 10.1001/jamanetworkopen.2022.14379. PubMed PMID:35622362 PubMed Central PMC9142868.
  10. Massara, P, Spiegel-Feld, C, Hamilton, J, Maguire, JL, Birken, C, Bandsma, R et al.. Association between gut MIcrobiota, GROWth and Diet in peripubertal children from the TARGet Kids! cohort (The MiGrowD) study: protocol for studying gut microbiota at a community-based primary healthcare setting. BMJ Open. 2022;12 (5):e057989. doi: 10.1136/bmjopen-2021-057989. PubMed PMID:35534076 PubMed Central PMC9086606.
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Affiliations & Other Activities

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