The Hidden Impact: Waste from Single-Use Breast Milk Storage Bags in New Zealand

The Hidden Impact: Waste from Single-Use Breast Milk Storage Bags in New Zealand

Breastfeeding is widely recognized for its numerous benefits for both infants and mothers. As many parents embrace breastfeeding, the use of single-use breast milk storage bags has become increasingly popular. However, a critical aspect of this practice is often overlooked—the environmental impact of these bags. In New Zealand, where environmental sustainability is a growing concern, understanding the waste generated by single-use breast milk storage bags is crucial for developing more sustainable practices.


The Popularity of Single-Use Breast Milk Storage Bags

Single-use breast milk storage bags are designed to provide a convenient, hygienic method for storing and freezing breast milk. They are especially favoured by busy parents who want to manage their milk supply efficiently and ensure that their babies receive the nutritional benefits of breast milk even when they're not available to nurse directly. These bags are typically made from plastic materials, including polyethylene and other polymers, which are chosen for their durability and ability to keep milk fresh.


Estimating Annual Waste Generation

To grasp the scale of waste generated, it’s essential to consider a few key figures and make some calculations:

In New Zealand, approximately 80% of mothers initiate breastfeeding at birth, with many continuing for several months. According to recent statistics, there are about 56,000 births per year in New Zealand. While there are many variables to consider (for example, mothers that do not express any breast milk, exclusively pumping mothers who may use more than average, mothers that feed longer or shorter than 6 months, etc.), if we average each of those mothers using just one bag per day for the first six months of their baby’s life, this amounts to 56,000 x 80% x 183 days = 8,198,400 single-use milk storage bags used per year in New Zealand alone.


Environmental Impact of Single-Use Plastic Bags

Single-use breast milk storage bags are made from plastic, which presents significant environmental challenges:

  • Plastic Waste: Most of these bags are not recyclable through standard curbside programs. They often end up in landfills where they can take hundreds of years to decompose. The accumulation of plastic waste contributes to broader environmental issues such as soil contamination and wildlife harm.
  • Resource Consumption: The production of plastic bags involves the extraction and processing of fossil fuels, which contributes to greenhouse gas emissions and other environmental degradation.
  • Microplastics: Over time, plastics in landfills break down into microplastics, which can infiltrate ecosystems and food chains, posing risks to wildlife and human health.

Moving Towards Sustainable Alternatives

The environmental impact of single-use breast milk storage bags has sparked interest in finding more sustainable alternatives. Here are some options being explored:

  • Reusable Storage Solutions: Reusable breast milk storage containers made from glass or BPA-free plastic offer a viable alternative. These containers can be washed and sterilized for repeated use, significantly reducing waste.
  • Biodegradable Bags: Some companies are developing biodegradable breast milk storage bags made from materials that break down more quickly than conventional plastics. While these are still relatively new to the market, they represent a promising step toward reducing plastic waste.
  • Educational Initiatives: Raising awareness among new parents about the environmental impact of single-use products can encourage more sustainable practices. Supporting initiatives that promote the use of reusable items can help shift consumer behavior toward more eco-friendly choices.

At Baby Jasper, our reusable breast milk storage bottles are our way of reducing the impact of single-use products without overwhelming new mamas with tricky instructions or extra workload. Our bottles can be used for years to come as baby grows up, and cleaned alongside your normal bottle wash.


The scale of waste generated by single-use breast milk storage bags in New Zealand underscores a critical environmental issue. With a rough estimate of over 8 million bags potentially ending up as waste each year, the need for sustainable solutions is more pressing than ever. By exploring and adopting reusable or biodegradable alternatives, and by increasing awareness about the environmental impact of single-use plastics, we can make strides toward reducing the ecological footprint of breastfeeding practices. It’s a collective effort that will benefit both current and future generations, ensuring a healthier planet for our children.

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