Hi, friend, if you want to give birth in China, then, after you meet your little angel, you must communicate with the Embassy immediately and :

1. tell them the updated change
2. turn in your LPs (you and your spouse)
3. supply your baby's notarized birth certificate and application fee(100$CAD)
4. filling in new aplication forms is best

If you give birth in China and do not inform the Embassy, you are unable to land Canada.