I got PR in October 2018, I came back to my country of citizenship after soft landing, then I went back to Canada in September 2019 and had to come back to my home country in June 2020 as my father passed away.
From a simple math perspective: you had approximately 8-9 months in Canada from the time of your landing - count the number of days. I'm going to call that appr 270 days.
When you return, that means you will need approximately 460 days, or about 16 months. Return tomorrow and you would be back in compliance by about April/May 2024. With an important caveat that you start 'losing' days from September 2019 if you return later than about May 2023 (basically if 1095 days pass between June 2020 and the date you return, you have to 'start over').
Therefore: strongly encourage you apply for TRV for the child ASAP if you believe you cannot leave the child. While having to wait a year + to apply to sponsor seems long, it will be an additional 9-10 months if you do not return earlier (soonest really).
As others have noted, this is not easy and you might well decide to remain in your home country. I am pointing it out this way to make the math clear to you: if you are going to do this, do not waste time, becuase the calendar will work against you.
I also note: there are differing opinions here about whether one can apply to sponsor spouse/child while not in compliance (well, you can of course, the quesiton is whether there is a significant risk in doing so). I do not pretend to know the definitive answer to this.
It is possible it would simply be processed normally. It is possible it would just be delayed. It is possible, although perhaps somewhat less likely, that this would start a review of your PR status and loss eventually due to non-compliance. I do not believe this is as clear cut as some here say, but don't feel I know. (You can consider hiring a lawyer at some point, but there is no immediate urgency to this - as compared to returning to Canada sooner if you want less problems or waiting).
You can research this later, you can decide this later, but if you say you MUST travel with your child, you need to apply for TRV immediately. You only increase the likelihood of having to travel alone (or spending more time apart) if you wait.
I repeat: the math of the residency obligation (the rolling five-year window) is relentless and will only get worse if you delay.
Good luck.