Replacing Old Nipples?
My sitter attributes a leaky bottle to old nipples. What's the general lifespan of nipples? Does it change based on type? Does it change based on how you wash it (dishwasher vs. handwashing)? My daughter uses the Soothie silicone nipple. Since she's outgrowing her Medela bottles, I was going to switch to larger Born Free bottles. Or, is my sitter mistaken?