Sounds like BH to me, I got them at 18 weeks as well so nothing to worry about! As for the Baby Jogger, it's big but not to big for the shops. However the main reason I don't take it to the shops (at the mo) is getting the bassinet thingy in and out before you can fold it is a bit tricky. So out of pure laziness I use my stroller which is much easier to get the bassinet attachment in and out. Hope this helps! Saying all this I would not be without BJ and I sure (if) when I have more kids it will be invaluable.