Designing for a future without HIV.



In sub-Saharan Africa alone, more than 200,000 newborns are infected with HIV via breast milk every year. Although it is the ideal nutrition for infants, other diseases can also be transmitted. Pasteurization is a way of eliminating viruses and bacteria through heat.


How can we make pasteurization more accessible, easier and safer? How can the process be carried out efficiently, especially in low-resource areas?

Siza System is a product family for inactivating viruses in breast milk by pasteurization, especially designed for use in resource-poor regions. By monitoring the current temperature in the process the system enables even untrained users to carry out


safely and conveniently.

Siza Core

The core element of the Siza system is a digital thermometer that monitors the temperature during the pasteurization process. It provides the user with feedback via light and sound signals. For more professional applications it can wirelessly connect to a smartphone to display more detailed information. Siza Core is used in three constellations for different requirements.

Siza Pro

The rate of preterm babies is particularly high in developing countries. Since their immune system is weak, breast milk must always be pasteurized for them.

Because time in the neonatal intensive care unit is an important factor, Siza Pro heats breast milk very quickly. For documentation and monitoring, the data is sent to a smartphone and stored in an online database.

Siza Plus

Breast milk banks always pasteurize their milk for safety. To be able to treat several portions at the same time, Siza Plus includes a holder for four portions. As with Siza Pro, pasteurization can be precisely monitored and tracked via a smartphone connection.

Siza One

For private households, the system includes a bottle holder for one portion. In this combination, the product does not require a smartphone or electricity. Nevertheless, it guides the user safely and easily through the process without the risk of incomplete pasteurization and without losing valuable nutrients.

Sub-Saharan Africa

Sub-Saharan Africa has the highest HIV infection rate in the world. In addition, medical care is severely restricted in many countries. That is why simple breast milk pasteurization could have a large impact there.


The Research is divided into five areas, ranging from breast milk, viruses and developing countries to HIV and pasteurization. It also uncluded interviews with experts from South Africa and Ethiopia as well as a doctor and lactation consultant from germany. The knowledge map shows the various connections between the subject areas.

The research showed that both the costs and the technical requirements of current devices for pasteurizing breast milk pose a problem. At the same time smart phones are also widespread in developing countries and particularly well suited to guide users safely through the process.


Pasteurization is the process of heating a liquid to a certain temperature in order to destroy viruses and bacteria. Most germs can be rendered harmless by this process, including HIV, CMV, salmonella and hepatitis.


We developed many possibilities how breast milk pasteurization could be made more efficient and accessible. Finally the most promising concept, including a smart thermometer was picked and combined with other solutions.


We built a fully functional prototype of the Siza Core Element that could measure the temperature in the 3D printed bottles and send the information to a smartphone. The remaining parts of the product system were built as design models to illustrate the functionality of the product family.


Siza System

Breast Milk Pasteurisation

Bachelor's Thesis

HfG Schwäbisch Gmünd



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Stephan Thiemt

Jonas Knödler


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