We want to study how a baby’s first months of life, including factors like their birth, family and living conditions might affect how they cope with common illnesses like coughs, colds and stomach bugs, or more serious infections.

This study will look back at the lives of a group of babies to understand how their early experiences might affect how their immune system develops and their ability to handle infections as children. We will analyse information collected about these babies, including details about the pregnancy and birth, their family lifestyle and living conditions as well as how often and what kind of illnesses they have during childhood.

The study aims to find out if any of these early factors influence how well children cope with infections. For example, the study might find that that certain living conditions, like their housing, spending time outdoors or having siblings or pets can make children more or less likely to get sick.

The goal is to identify patterns and factors that could help improve health outcomes for children by understanding what makes some babies more resilient to infections. This information could be used to guide parents and healthcare providers in making decisions that support better health during a child's early years.