Give birth in Canada

Yes, because your child has been a Canadian citizen since he was born in Canada, and he certainly has the right to go to China.

You can't reunite and immigrate until your children reach adulthood and have a stable income in Canada; Remember, it doesn't mean that you can go there when your children are adults, because Canada needs to confirm that your children have the ability to bear your living expenses in Canada, that is, they will be released after they have a stable income.

Also, if you want your child to be born abroad, try not to get pregnant too early before going abroad, because even if you go to the Canadian customs, if the customs officers find you are pregnant (your stomach is too big), but you only have a work visa, you will be repatriated.