I agree with smitff, there are different ways to spend time in India, the ideal with a baby is five star all the way but bear in mind that's going to be spenny. I've been a few times and went when my youngest was 10/11 months at the time. November is a lovely time of year to go in the North.
Where's the wedding?
In some ways if your baby is only 6/7 months old at the time it's easier as you can take baby food with you, boil water in hotel rooms and so long as you're careful what you eat and drink you should both be fine.
Bear in mind that taxis don't always have seat belts in the back so you would need to make sure you book a driver through the hotel with seat belts so you can use a car seat!
As someone else says maybe aim to book flights a month or two after the baby's born and you can see how you feel then.
How difficult it will all be primarily depends on your mindset. I first travelled long haul with my children from around 4 months and took them to places like Thailand and India from a young age as we lived in Asia at the time.
I've seen huge changes in India over a 10 year period of travel there with children but my experience is primarily of Delhi. Parts of it feel like Singapore, fancy high end malls with all the designer shops.
There are also fewer cows wondering around there these days!
If you decide it's not something you want to do as a family, hope you manage to go anyway, weddings in India can be amazing!