STM's What pump parts need replacing?

HML5382

I'm trying to come up with a list of things I need for Baby #2 and wondered what I might need to replace as far as breast pump parts. I have an Ameda if that makes any difference. I was just a supplemental pumper so I don't think anything is really worn out, but wasn't sure if just sterilizing was ok or if I need to replace parts to make it sanitary for the new baby. Anyone know anything about this?