The EU Child Cohort Network, established by the Horizon2020-funded LifeCycle Project (733206), brought together nineteen pregnancy and childhood cohorts, together including more than 250,000 children and their parents. A large set of variables has been harmonised and standardized across these cohorts. The harmonized data are kept within each institution and can be accessed by external researchers through a shared federated data analysis platform using the R-based platform DataSHIELD, which takes relevant national and international data regulations into account, and open access catalogue, both of which were operated by MOLGENIS team.