Bottle nipples are the most challenging part of any feeding setup to sanitize because their soft folds and internal valves are designed to control milk flow—a design that unfortunately traps milk film that a quick rinse often misses. Unlike the smooth bottle body, a nipple requires specific attention.

• Turn it inside-out: To reach hidden residue, you must turn the nipple inside-out or use a specialized small brush.

• Don’t wait for visible dirt: Skipping this step is why bottles can smell fine but still harbor old residue.

• Consistency is key: Using a dedicated cleanser and a nipple-specific brush every single time—not just when it looks dirty—is the only way to ensure it stays genuinely clean.