We all perceive the sensory world around us differently. Some autistic children for example are overwhelmed by sounds or touch. This can make everyday situations such as visiting a busy supermarket a challenging task for families. Being overly sensitive has also been linked to anxiety. This project will explore if sensory reactivity, such as being oversensitive to sounds, can predict later anxiety and related mental health symptoms. To do so we would analyse already collected ALSPAC data on sensory reactivity and mental health symptoms from 6 months of age onwards. This includes already collected caregivers questionnaires about how their child reacts to the sensory world around them, such as sounds and lights, and questions about anxiety. That way we can test if the relationship between sensory reactivity and anxiety and related mental health issues is stable over time. Also we can test if early sensory reactivity can predict later mental health symptoms. Identifying whether sensory reactivity predicts mental health symptoms over time could lead to a clinical impact. If sensory reactivity symptoms such as being oversensitive to sounds are identified and treated earlier, it might be possible to reduce the impact of subsequent mental health problems, such as anxiety. Last, this project will allow us to investigate genetic underpinnings of sensory reactivity and identify potential biomarkers for sensory reactivity issues, such as hyper-and-hypo reactivity.