There is a new baby furniture store in the Prudential Mall downtown, right next to Isis Maternity. I haven't been inside but passed by and it looks nice. Also there are a number of boutique stores, like Magic Beans in Brookline that carry baby furniture. Lastly I'm not sure if I'm into it or not (see earlier posting) but I assume the upcoming Drool Expo will have a bunch of vendors.
Re: baby furniture
We got ours from the Baby Furniture Warehouse in Reading. There's one in Braintree too I think.
https://www.babyfurniturewarehouse.com/