[1] The hospital was founded in January 1923 by Dr. Irma Levasseur and his colleagues René Fortier, pediatrician, and Edward Samson, orthopedist.

[2] The objective Levasseur is the creation of a first pediatric hospital run by the laity in Quebec .

The Archdiocese of Quebec allowed the corporation to obtain the services of the Dominican Sisters of the Child Jesus.

On 14 March 1927, it settled definitively in the former juvenate of the Brothers of the Christian Schools, 395, chemin de la Canardière.

In the second half of the century, the hospital introduced new medical services, with subspecialties in neurology and traumatology.