if you are planning on for soft landing and give birth in Ontario, you may not qualify to be covered by OHIP. There is minimum requirement for the first year of stay to be covered. btw there is no 3 months waiting period currently.
https://www.ontario.ca/page/apply-ohip-and-get-health-card
Who qualifies
With certain exceptions, to qualify for OHIP, you must meet
all of the minimum qualifications listed below
plus at least 1 of the additional requirements.
To meet the minimum qualifications you must:
- be physically in Ontario for 153 days in any 12‑month period
- be physically in Ontario for at least 153 days of the first 183 days immediately after you began living in the province
- make Ontario your primary residence