We used to live in NYC, and the public transport is great.
If you are really keen to have some car seat options, though, including the long ride back to the airport at the end of your trip or for any ventures outside the city:
Go to amazon.com:
Buy a Graco Snug Ride or similar capsure (you will find that many capsules in the U.S. can be secured via seatbelt only if need be). Buy a "universal stroller base" and voila -- you have a lightweight pram.http://www.amazon.com/Graco-SnugRide-Infan...graco+snug+ride
There are other brands out there (e.g. Jeep, Kolcraft -- just search "universal stroller base" on amazon or other U.S. based stores), including combos that are less expensive than Graco.
This is light enough to use on the subway as well. The great thing about this set up is that if you are, say, out at dinner and your baby falls asleep, you can leave him sleeping in his capsule. Plus, the storage underneath is fab!
We used our Graco capsule + Kolcraft base so, so much when our daughter was young -- both in NYC & then when we moved to Singapore.
Have a great trip!
This post has been edited by baddmammajamma: 14/11/2012, 09:51 AM