i am looking at the medela bottles and notice the styles and even nipples seem to be different than 2 years ago..
we have this style http://tinyurl.com/ycxpv4n
now the bottles look like this http://tinyurl.com/y9ejqn4
are the old bottles, nipples, discs, etc. compatible with the new ones? we used nuk nipples with the "old" bottles but now it looks like medela has a new "wide based" nipple.