Do You Need to Dry Baby Bottles After Sterilising?

You've finished a sterilising cycle and the bottles are wet inside. Do you need to dry them before use? Is the water safe to leave in? And if you do need to dry them, what's the least annoying way to do it? 

Here's a straightforward answer. 

Is water left in sterilised bottles safe? 

Yes, with one important distinction: the water inside a properly sterilised bottle has been steam-treated and is not a contamination risk. You don't need to panic if there's condensation inside after the cycle. 

The concern isn't the water from sterilising – it's how you dry the bottle afterwards. If you:

• Pat the bottle dry with a cloth or tea towel, you're introducing bacteria from the fabric into the freshly sterilised bottle
• Leave bottles to air-dry on an open drying rack, airborne bacteria settle inside within a short time
• Use a dirty bottle brush or drying rack that hasn't been cleaned recently, same problem

The irony is that overzealous drying using non-sterile materials can recontaminate a sterile bottle faster than leaving the condensation alone. 

The safest approach to drying sterilised bottles 

Leave them in the sealed steriliser

If your steriliser has a sealed lid that maintains sterility, leave the bottles inside. The residual heat will help evaporate moisture over time. This is the simplest approach for bottles you're using within 24 hours. 

Assemble immediately and leave upright

After sterilising, assemble the bottle immediately – teat, collar, cap – to prevent recontamination. Any remaining water inside is sealed in and won't cause harm. The bottle is ready to use. 

Use a steriliser with a built-in drying function

All-in-one machines with a drying cycle solve this problem entirely. After the sterilising step, the drying cycle removes moisture using hot air, so bottles come out dry and ready to store or use. The Bebello 4-in-1 works this way – wash, sterilise, and dry in one unattended cycle. 

Air-dry on a clean, dedicated drying rack

If you need to air-dry, use a rack dedicated to sterilised bottles (not a general kitchen drying rack that also dries dishes and cutting boards). Position bottles upside-down so water drains out rather than pooling inside. 

Do bottles need to be dry before sterilising? 

This is a slightly different question and worth addressing: do bottles need to be dry before you put them in the steriliser? 

For electric steam sterilisers, no – a small amount of water on the bottle won't affect the sterilising cycle. Excessive water can dilute the steam slightly, so shaking off obvious droplets is worth doing, but full drying isn't required. 

For UV sterilisers, yes – wet bottles reduce UV effectiveness significantly. Bottles should be dry before a UV cycle. 

What about MAM bottles specifically? 

After self-sterilising MAM bottles in the microwave, the base and components will be very hot and wet. Leave them to cool fully (at least 10 minutes, ideally more) before handling. The components are sterile – the condensation inside is harmless. Assemble immediately after cooling and the bottle is ready to use. 

If drying bottles is the part of your routine you find most annoying, the Bebello 4-in-1 handles it automatically – bottles come out of the cycle clean, sterile, and dry. 

Frequently asked questions 

Should I dry sterilised bottles with a clean towel? 

Avoid it if possible. Even a clean towel introduces fibres and bacteria into the freshly sterilised bottle. Leaving bottles assembled or air-drying on a dedicated rack is safer. 

How long does air-drying take? 

Typically 30-60 minutes for full air-drying at room temperature. Positioning bottles upside-down helps. 

Can I use a hairdryer to dry sterilised bottles? 

Not recommended – the air flow introduces bacteria and particles from the environment. It's faster, but it recontaminates. 

What's the quickest drying method? 

An all-in-one bottle washer with a heated drying cycle is the fastest and safest method – bottles come out dry and sterile with no additional steps.