By Owen PalmerChoosing a baby bottle involves more than picking a color or a brand. The material, shape and nipple flow all affect how your baby feeds, and the right match can make feedings smoother for both of you. The U.S. Centers for Disease Control and Prevention (CDC) and other health agencies also emphasize that how you clean and store bottles is just as important as what you buy. This guide walks through the main baby bottle types, nipple options and care steps, drawing on the CDC, the FDA, MedlinePlus (NIH) and Nemours KidsHealth.
Baby Bottle Materials
Bottles come in several materials, each with trade-offs. MedlinePlus explains that plastic bottles are lightweight and will not break if dropped, but it recommends buying new plastic bottles because reused or hand-me-down bottles may contain bisphenol-A (BPA). The Food and Drug Administration (FDA) banned the use of BPA in baby bottles due to safety concerns, and KidsHealth confirms that plastic bottles are now BPA-free. Glass bottles, according to MedlinePlus, do not have BPA and are recyclable, but they can break if dropped. MedlinePlus notes that some manufacturers sell plastic sleeves to keep bottles from breaking, and KidsHealth says silicone sleeves make glass bottles easier to grip and help prevent breaks. Stainless steel bottles are described by MedlinePlus as sturdy and unbreakable, though they may be more expensive; KidsHealth similarly notes that stainless steel and silicone bottles are unbreakable but tend to cost more than plastic or glass. Disposable bottles use a plastic sleeve inside that you throw away after each use. MedlinePlus says the liner collapses as the baby drinks, which helps prevent air bubbles, and liners save on cleanup and are handy for traveling, but they add an extra cost because you need a new liner for every feeding.
| Material | Pros | Cautions |
|---|---|---|
| Plastic | Lightweight, won’t break, BPA-free (new bottles) | Reused or hand-me-down bottles may contain BPA; buy new |
| Glass | No BPA, recyclable; silicone sleeves reduce breakage risk | Can break if dropped; potential injury from broken glass |
| Stainless steel | Sturdy, won’t break | May be more expensive |
| Disposable liners | Liner collapses to reduce air bubbles; less cleanup; good for travel | Extra cost for new liner each feeding |
Bottle Shapes and Features
MedlinePlus outlines several bottle shapes. Standard bottles have straight or slightly rounded sides, are easy to clean and fill, and let you easily see how much milk is in the bottle. Angle-neck bottles are easier to hold, and the milk collects at the end of the bottle, which helps prevent your baby from sucking in air; however, they can be harder to fill and you may need to hold them sideways or use a funnel. Wide bottles have a wide mouth and are short and squat. MedlinePlus says they are said to be more like a mother’s breast, so they may be a good option for babies who go back and forth between breast and bottle. Vented bottles have a venting system inside to prevent air bubbles and are said to help prevent colic and gas, but MedlinePlus notes this is unproven. These bottles have a straw-like inner vent, so you will have more parts to keep track of, clean and assemble. KidsHealth adds that some babies do better with certain bottle shapes, vented bottles or bottles with liners, and you may need to try a few kinds before finding what works best.
Nipple Types and Flow Rates
Nipples are made from latex or silicone, according to MedlinePlus. Latex nipples are softer and more flexible, but some babies are sensitive to latex and they do not last as long as silicone. Silicone nipples last longer and tend to hold their shape better. KidsHealth also describes silicone nipples as clear and latex nipples as brown. Nipple shapes vary: MedlinePlus lists dome-shaped, flat and wide nipples, noting that flat or wide nipples are shaped more like a mother’s breast. KidsHealth mentions standard or traditional nipples, orthodontic nipples, wide-based nipples and flat-top nipples, and advises using whatever type your baby seems to prefer.
Flow rate is a key factor. MedlinePlus explains that nipples come in slow, medium or fast flow rates, often numbered with 1 as the slowest. Infants usually start with a smaller hole and slower flow, and you increase the size as your baby gets better at feeding and drinks more. If your baby is choking or spitting up, the flow is too fast. KidsHealth similarly states that flows that are too fast can make younger babies gag, while slower flows may frustrate some babies and make them suck harder and gulp too much air. It recommends starting a newborn on the slowest flow nipple and increasing the flow as the baby gets older, though some babies may be content with the same kind and size of nipple throughout infancy. KidsHealth also advises checking nipples regularly for signs of wear and replacing them about every 2 months or sooner if you notice tears or damage; MedlinePlus warns to throw out cracked or torn nipples because small pieces can come off and cause choking.
Cleaning, Sanitizing and Storing Bottles
The CDC provides detailed guidance on cleaning and sanitizing infant feeding items. It says to clean bottles after every feeding. If your baby does not finish a bottle within 2 hours, throw away the unfinished formula because germs can grow quickly if breast milk or formula is added to a partially used bottle or if a used bottle is only rinsed. For formula containers, the CDC advises avoiding liquid cleaners on the outside to prevent contaminating the powdered formula inside; if you want to clean the container, use a disinfectant wipe or paper towel sprayed with disinfectant on the outside and lid before first opening, and wait until surfaces are completely dry. Do not submerge the container or place it under running water, and do not clean the inside. The formula scoop should be cleaned only if it gets dirty, and then cleaned as carefully as baby bottles and allowed to air-dry completely before returning it to the container.
MedlinePlus recommends sterilizing bottles and nipples when you first buy them by placing all parts in a pan covered with water and boiling for 5 minutes, then washing with soap and warm water and air drying. The CDC says sanitizing is important for extra germ removal, and it should be done daily if your baby is less than 2 months old, was born prematurely or has a weakened immune system. For older, healthy babies, daily sanitizing may not be necessary if items are cleaned carefully after each use. If you use a dishwasher with hot water and a heated drying cycle or sanitizing setting, a separate sanitizing step is not necessary. When cleaning by hand, use soap and warm water and a bottle and nipple brush that you use only on baby bottles and parts, as MedlinePlus notes. The CDC adds that air-drying items on a clean dish towel or paper towel is probably more hygienic than using a drying rack, because drying racks may trap moisture and allow mold and germs to grow. If you use a drying rack, use it only for infant feeding items and wash, sanitize and dry it thoroughly every few days, or at least daily for higher-risk babies. Once everything is completely dry, wash your hands, reassemble the clean parts and store them in a clean, protected area such as a closed kitchen cabinet used only for clean dishes.
For more on the tools that make cleaning easier, see our bottle cleaning and drying equipment guide. If you are also setting up a feeding station, our feeding supplies for starting solids article covers what you will need as your baby grows. And for a broader look at what gear to have on hand at each stage, visit the baby gear checklist by stage.
Frequently asked questions
How do I know if the nipple flow is right for my baby?
MedlinePlus says your baby should be able to get enough milk without having to suck too hard. If your baby is choking or spitting up, the flow is too fast. KidsHealth adds that a flow that is too slow may frustrate some babies and cause them to gulp too much air. Watch your baby’s cues and try a different flow rate if feedings seem difficult.
Do I need to sterilize bottles every day?
The CDC states that daily sanitizing is recommended for extra germ removal if your baby is under 2 months old, was born prematurely or has a weakened immune system. For older, healthy babies, daily sanitizing may not be necessary if you clean bottles carefully after each use. A dishwasher with a hot water and heated drying cycle can eliminate the need for a separate sanitizing step.
Are glass bottles safer than plastic?
According to MedlinePlus, glass bottles do not contain BPA and are recyclable, but they can break if dropped. The FDA has banned BPA in baby bottles, and KidsHealth confirms that new plastic bottles are BPA-free. KidsHealth points out that glass can cause injury if it breaks. Beyond that, the trade-offs are weight, breakage and cost, so the choice is yours; if you have concerns, discuss them with your pediatrician.
Ready to explore more feeding gear? Browse our high chairs and feeding section for related guides.
Sources
- MedlinePlus: Buying and Caring for Baby Bottles and Nipples
- Nemours KidsHealth: Formula Feeding FAQs, Getting Started
- FDA: Bisphenol A (BPA), Use in Food Contact Application
- CDC: How to Clean, Sanitize, and Store Infant Feeding Items
About Owen Palmer
Owen Palmer is part of our editorial team and reviews and edits our baby gear guides, checking product details against manufacturer specifications and owner feedback.
