Thanks
oliver2002 and
Keyser for your input. Our trip is now safely done and this is our experience.
SFO:
1. We had a lot of stuff with us primarily for the baby. TSA staff were super helpful in getting everything cleared.
2. Installed the mamava app to find and unlock lactation spaces in the airport. They are very comfy and private.
Delhi:
1. There is a seperate line for people with babies in immigration - we were second in line and were done in about 10 minutes.
2. The customs line is long. If worried about covid, this is the weak point since there seemed to be little effort towards any social distancing here. Due to a comedy of errors we ended up inadvertently jumping this queue (we tried to ask an airport staff member if there is a seperate queue in customs for people with babies like the one in immigration - I don't think he understood the question but he walked us to the head of the long queue and then out of it after talking to the official there). We were bewildered.
3. Turned towards the place marked domestic transit. Security didn't make any fuss about 4 hours. The vistara bagge dropoff is right there. They reissue new boarding passes and luggage tags. Then we took the elevator up to the departure level.
4. There is a seperate line in security check for business class. No one else were in that line.
5. The vistara business class lounge was closed. Instead we were allowed two free hours in the plaza premium lounge. If worried about covid, it would be best to avoid this lounge. We only went there to ask them if they can store some bottles with breast milk in their refrigerator. They agreed though their refrigerator seemed to not do a good job.
6. It was pretty easy to find places to sit without anyone else near by. At least in the time we were there, it looked like there is no need to book a hotel just to avoid crowds for covid. There is certainly a big crowd but it is very well dispersed that it is possible to easily navigate it without having to come close to anyone.
7. There are comfortable diaper changing stations next to many of the restrooms.