Author: G.J. van Beveren Date: 7-10-2025 This repository contains the supplementary data accompanying the manuscript Perinatal exposures are related to atopic symptom development in early childhood published in Clinical & Experimental Allergy DOI: will follow upon publication under 'related works'. The supplementary data contains: Supplementary Methods Supplementary Figures Figure S1 | Flowchart study Figure S2 | Number of study participants stratified per cohort per timepoint Figure S3 | Atopic symptoms over time Figure S4 | Correlation between determinants Figure S5 | Biochemical signals of atopy at age five years Supplementary Tables Table S1 | Origin other allergy symptoms Table S2 | Secondary outcomes Table S3 | Determinants Table S4 | Baseline characteristics Table S5 | Atopic symptoms over time using logistic regression Table S6 | Atopic symptoms over time using Firth's penalized logistic regression