Quick Answer
Each material has genuine advantages and trade-offs. Glass is the most chemically inert and easiest to sterilise, making it the preferred choice for parents who prioritise purity and longevity. Silicone is lightweight, shatterproof, and free from harmful chemicals, making it a practical middle ground. Plastic is the lightest and most affordable option, but quality varies significantly and it is worth choosing bottles that are BPA-free and made from food-grade materials. The best bottle for your baby is the one they will accept, made from a material you are comfortable with.
Glass Baby Bottles
Advantages
- Chemically inert: Glass does not leach any chemicals into milk, regardless of temperature. It is the safest material from a chemical exposure standpoint
- Easy to sterilise: Glass can withstand high-temperature sterilisation methods including boiling, steam sterilisers, and dishwashers without degrading
- No staining or odour retention: Glass does not absorb smells or stains from milk, making it easier to keep clean over time
- Durable over time: Glass does not scratch or degrade with repeated use and sterilisation the way plastic can
- Environmentally friendly: Glass is recyclable and does not contribute to microplastic pollution
Disadvantages
- Heavier: Glass bottles are heavier than plastic or silicone, which can be a consideration for older babies who hold their own bottle
- Breakable: Glass can shatter if dropped, which is a practical concern, particularly as babies become more mobile. Many glass bottles are sold with a silicone sleeve to reduce this risk
- Higher cost: Glass bottles are generally more expensive than plastic alternatives
Silicone Baby Bottles
Advantages
- Lightweight and shatterproof: Silicone is significantly lighter than glass and will not shatter if dropped, making it a practical choice for older babies and toddlers
- Chemical-free: Food-grade silicone does not contain BPA, phthalates, or other chemicals of concern
- Soft and flexible: The soft texture of silicone can be more comfortable for some babies to hold and may be gentler on teething gums
- Sterilisation-safe: Food-grade silicone can be boiled, steam-sterilised, and dishwashed without degrading
Disadvantages
- Can retain odours: Silicone can absorb smells over time, particularly from strongly flavoured foods or formula
- Less widely available: Silicone bottles are less common than glass or plastic options, with fewer brands and designs to choose from
- Higher cost: Silicone bottles tend to be more expensive than plastic
Plastic Baby Bottles
Advantages
- Lightweight: Plastic is the lightest option, which can be an advantage for babies who hold their own bottle
- Affordable: Plastic bottles are generally the most affordable option and are widely available
- Shatterproof: Plastic will not break if dropped
- Wide variety: The widest range of bottle designs, sizes, and teat options is available in plastic
Disadvantages
- Chemical concerns: Older or lower-quality plastic bottles may contain BPA or other chemicals that can leach into milk, particularly when heated. Always choose bottles labelled BPA-free and made from food-grade plastic (look for recycling codes 2, 4, or 5)
- Degrades with use: Plastic scratches and degrades with repeated sterilisation and use, which can increase the risk of chemical leaching over time. Replace plastic bottles regularly if you notice scratching or cloudiness
- Staining and odour retention: Plastic can absorb smells and stains from milk and formula more readily than glass
- Environmental impact: Plastic contributes to microplastic pollution and is less environmentally friendly than glass
What About the Teat?
The bottle body material matters, but the teat is equally important. Most teats are made from silicone or latex. Silicone teats are more durable, easier to sterilise, and less likely to cause allergic reactions than latex. Latex teats are softer and more flexible but degrade faster and are not suitable for babies with latex sensitivity.
Teat shape is one of the most significant factors in whether your baby will accept a bottle. A breast-shaped teat that closely mimics the natural latch is particularly important for breastfed babies. The Emulait Classic Bottle features a breast-shaped silicone nipple designed to work with your baby's natural sucking motion, and is available in a glass body for parents who want the chemical purity of glass with a teat designed for breastfed babies.
Which Should You Choose?
There is no single right answer. Consider the following:
- If chemical purity and longevity are your priorities, choose glass
- If you want a lightweight, shatterproof, chemical-free option, choose food-grade silicone
- If affordability and availability are the primary considerations, choose BPA-free plastic and replace bottles regularly
- Whatever material you choose, prioritise teat shape and flow rate, as these have the greatest impact on whether your baby will accept the bottle
Key Takeaway
Glass is the gold standard for chemical safety and durability. Silicone is a practical, lightweight, chemical-free alternative. Plastic is affordable and widely available but requires careful selection and regular replacement. Whichever material you choose, the teat shape and flow rate matter more than the bottle body for most babies. Choose a material you are comfortable with and a teat your baby will accept.
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This article is for informational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always consult your pediatrician or a qualified healthcare provider with questions about your baby's health.