Hello! I saved just about everything from my DS' babyhood, which was in 2003. I've just recently read an article regarding getting new bottles, if it's been more than 2-3 years. I'm expecting #2 in October, and that will make it almost 5 years since we've used our Playtex Drop-in Bottles. I also have a nearly full box of Drop-in liners for them. Does anyone know if I can still use either of these or both - the bottles and/or liners? Thanks!