The fourth trimester is tough to plan around - nap times are inconsistent, your baby isn't fully vaccinated, you're still getting the hang of feeding, and you might still be recovering from the birth But there are still quite a few things that you can do in and around London to fit around your (and their) comfort levels.
Go for walks
This is really the simplest and most flexible way for you to get out. Fortunately, London has a tonne of green spaces and parks that are really pram friendly. I have a few walks recommended here, and will post more as I find them or test them:
Check out your local library
Libraries, community centres, and children's centres typically have a variety of activities to help new parents get out of the house and meet other (very tired) parents. They're a great way to find other people going through the same things as you and spend time in a genuinely baby-friendly environment.
Get out for lunch
You may not consider pubs very baby-friendly, but during the middle of a weekday they're often quite empty and quite a lot of them now try to cater to young families with baby changing facilities etc. I met up with some friends at People's Park Tavern on a Friday for lunch and we only shared the place with a couple with a dog and a very moody cat. There are also plenty of cafes in and around London who have realised that they can make quite a bit more money from the mummy/daddy crowd on a Tuesday afternoon.
Go to the cinema
This definitely wasn't something I considered before having a baby, but I'm really pleased that baby screenings exist. They're typically not that full, aren't too overstimulating for the little one, and give you a comfortable, sheltered venue where you don't feel too bad if your baby starts crying or fussing.
Check out a gallery
This may be a little more brave, but the larger art galleries in London are spaced out and quiet too, and a lot of them have family rooms that you can use for a feed and change.