*** First and foremost, apologies

I am an Indian national on a Tier 2 General (now Skilled Worker) visa. I am due to submit my application for ILR around mid-Aug. I am also expecting my 2nd child around the same time. While the doctor has given an expected due date of the baby, it is universally known that the due date cannot be exactly pin-pointed. In this scenario, here are my questions:
1. If the baby is born in UK BEFORE ILR grant date, what should be the process? What is the expected cost of application / process?
2. If the baby is born in UK AFTER ILR grant date, what should be the process? What is the expected cost of application / process?
3. Should / could I also apply for India passport for the baby? What is CoE-RoA and what is its purpose in my case?
4. If Q3 is not applicable, when and how can I apply for OCI (Overseas Citizen Of India) card for the baby?
Appreciate your responses in advance!
