TL;DR
The way to clean a bottle nipple is to squeeze soapy water through the hole from the inside out, brush the interior with a narrow nipple brush, then squeeze clean water through until it runs clear. A clog is usually dried milk, and a nipple with a tear or a dark spot inside gets replaced rather than cleaned.
Why nipples are the hard part
A nipple is a small hollow shape with one tiny opening. Everything that makes it work also makes it hard to clean.
Milk fat clings to the inside wall. When it dries, it forms a film that a rinse will not touch and that eventually narrows or blocks the hole.
The seam where the nipple flares into the collar rim is another trap. Residue collects at that fold and stays there through a lazy wash.
Rinsing immediately after a feeding, in cool water, is what prevents most of this. Hot water first sets milk protein onto the surface.
How do you clean a bottle nipple?
Separate the nipple from the collar, rinse it in cool water, then fill it with warm soapy water and squeeze it repeatedly so the water jets out through the hole. Scrub the inside with a narrow nipple brush, then squeeze clean running water through it until the stream is clear and nothing feels slippery.
Turn the nipple inside out if it is flexible enough to do so without stretching the shape. Many silicone nipples tolerate this and it makes the inside easy to reach.
Do the rim and the underside of the flange too. Those get skipped constantly.
Use a nipple brush kept only for this. A brush that has scrubbed pans carries grease you do not want here.
Clearing a clogged nipple hole
Most clogs are dried milk that formed a plug. Soak the nipple in warm soapy water for a few minutes to soften it, then squeeze water through firmly.
If it is still blocked, squeeze from the inside so the pressure pushes the plug out rather than deeper in. Repeat several times.
Do not push a pin, needle, safety pin, or toothpick through the hole. That enlarges or tears the opening, which changes the flow rate and can create a choking risk from too-fast feeding, and it can leave a weak point that splits later.
If a hole will not clear with soaking and pressure, replace the nipple. They are inexpensive, and a modified hole is not something you can undo.
Powdered formula clogs more often than milk. Mixing thoroughly and rinsing right away both help a lot.
Why is my bottle nipple cloudy?
A cloudy or filmy nipple is usually hard water mineral buildup, detergent residue, or milk fat that dried onto the surface. A soak in a diluted white vinegar solution followed by a thorough rinse normally clears mineral film, while a proper soapy wash with a nipple brush handles fat residue.
Never combine vinegar with bleach in any container. That mixture releases toxic gas.
Rinse very thoroughly after any vinegar soak, since the nipple goes straight into a mouth.
Cloudiness that returns quickly, or a nipple that has gone tacky and slightly swollen, usually means the material is aging out. That is a replacement, not a cleaning problem.
Dark spots inside are not a stain
If you see dark specks or a dark patch inside a nipple that you cannot reach or scrub out, throw the nipple away. That is growth in a space you cannot clean, not a cosmetic mark.
The usual cause is water left inside after washing, then the nipple stored in a closed container while still damp. Squeezing the water out and air drying uncovered prevents it.
Do not try to bleach it out. There is no version of that which makes a contaminated nipple safe to feed from.
The same principle applies to sippy cup valves and gaskets, covered in how to clean sippy cup valves and lids.
Sanitizing, and when it applies
Wash first, always. Sanitizing does not work on a surface with residue on it.
If your manufacturer allows it, common sanitizing methods are a brief boil for the stated time, a steam sterilizer, or a dishwasher cycle with a sanitize or heated dry setting. Not every nipple material tolerates every method, so check the instructions.
Latex nipples are more heat sensitive than silicone and break down faster. Expect a shorter life and more frequent replacement.
Whether your baby needs routine sanitizing depends on age and health, and that is a pediatrician question. Cleaning and sanitizing reduce germs; they do not treat or prevent illness.
The full wash-then-sanitize routine for all the parts is in how to clean baby bottles.
Drying so nothing grows inside
Squeeze the nipple hard several times after the final rinse to force water out through the hole. Then do it again a minute later, because more will have collected.
Air dry uncovered on a clean drying rack, nipple side up or on its side so water can drain. Do not towel dry, since towels leave lint and transfer bacteria.
Store only when completely dry, in a clean dry container. A damp nipple in a sealed bag is how dark spots start.
When to replace a nipple
Replace it when you see a tear, a thinning spot, stickiness, swelling, discoloration, cracking at the base, or any dark mark inside. Also replace it if the flow rate has clearly changed.
Do the pull test regularly. Hold the base and tug the tip firmly; any stretching that does not spring back or any weak spot means it is done.
Most manufacturers recommend replacing nipples on a schedule regardless of appearance, since the material degrades with heat and use. Check the package for the interval that applies to yours.
Fitting it into the routine
Rinse in cool water immediately, wash in a batch with everything else, and inspect each nipple as you rinse it. That inspection takes two seconds and catches problems early.
If you pump as well, the valve membranes need the same delicate handling, covered in how to clean breast pump parts, and our guide to cleaning baby gear and kids equipment safely covers the rest of the daily rotation.
FAQ
How do you unclog a bottle nipple?
Soak the nipple in warm soapy water for a few minutes to soften the dried milk, then squeeze water through it firmly from the inside so pressure pushes the plug outward. Repeat as needed. Never push a pin or needle through the hole, since that enlarges or tears the opening and changes the flow rate.
Why does my bottle nipple look cloudy?
Usually hard water minerals, detergent residue, or milk fat that dried onto the surface. Soak the nipple in diluted white vinegar and rinse very thoroughly, or rewash with a nipple brush and hot soapy water. Never mix vinegar with bleach. If cloudiness returns quickly, the material is likely aging out.
What are the dark spots inside a bottle nipple?
They are almost always growth in the hollow interior, caused by water left inside after washing and then stored damp. You cannot reach or scrub that space, so throw the nipple away. Prevent it by squeezing water out after every wash and air drying uncovered on a clean rack.
Can bottle nipples go in the dishwasher?
Many silicone nipples can, on the top rack or in a closed-top basket so they do not fall through. Latex nipples usually cannot, since dishwasher heat degrades them quickly. Check the manufacturer instructions and hand wash when you are unsure, and always separate parts before running a cycle.
How often should you replace bottle nipples?
Replace any nipple immediately if it is torn, thin, sticky, swollen, discolored, cracked at the base, or dark inside. Beyond that, most manufacturers recommend a regular replacement interval regardless of appearance, since heat and use degrade the material. Check the package for the specific guidance.
Can you use a toothpick to clear a nipple hole?
No. A toothpick, pin, or needle can enlarge or tear the opening, which increases flow in a way that can make feeding unsafe, and it leaves a weak point that splits later. Soak and squeeze to clear a clog, and replace the nipple if that does not work.
Feeding-gear washing runs several times a day. If the rest of the house has slipped while you keep up with it, our house cleaning services can take that half. Every home is different, so the real number depends on size, condition, and what you want covered. Get a quote and we will walk you through it.