A really good one i found for DD is called a Fisher Price Stroll Along Walker. It is a pram but is made sturdy like a walker so its very hard to tip over. Was great when she was learning to walk and she still uses it now as a pram.
We got our DD the same & she still loves it We got her the my first doll to go with it & it fits in really well, but now she has other dolls & teddies that get rides in it too.