Acknowledgments
The authors would like to thank all the participants of this study as they gave their time during the difficult period of COVID-19 pandemic in Chile. Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations.

Supplementary Materials
The following are available online at https://www.mdpi.com/1660-4601/18/1/176/s1, File S1: Movement behaviours related questions included in the study, Table S1: Description of movement behaviours before and during the early stages of the COVID-19 pandemic in toddlers and pre-schoolers in Chile according to sociodemographic factors.
Click here for additional data file.

Author Contributions
Conceptualization, N.A.-F. and B.d.P.C.; methodology, N.A.-F., P.M.-F., M.T.-V., S.M.-M., C.C.-M., F.R.-R., and A.C.-O.; software, M.T.-V. and N.A.-F.; validation, N.A.-F. and M.T.-V.; formal analysis, N.A.-F. and B.d.P.C.; investigation, N.A.-F., P.M.-F., M.T.-V., S.M.-M., C.C.-M., F.R.-R., and A.C.-O.; resources, N.A.-F. and P.M.-F.; data curation, N.A.-F.; writing—original draft preparation, N.A.-F.; writing—review and editing, all authors; visualization, N.A.-F.; supervision, N.A.-F., P.M.-F., and A.D.O.; project administration, N.A.-F. and P.M.-F.; funding acquisition, N.A.-F. and P.M.-F. All authors have read and agreed to the published version of the manuscript.

Funding
The study was partially supported by the Research Office at the Universidad de La Frontera (DIUFRO DFP19-0012, Programa para grupos de alta productividad, apoyo a la inserción de estudiantes pre- y postgrado a la investigación DI20-2009, y apoyo a postulantes FONDECYT DI20-1002). ADO is supported by a NHMRC Investigator Grant.

Institutional Review Board Statement
The study was conducted according to the guidelines of the Declaration of Helsinki, and approved by the Scientific Ethics Committee at Universidad de La Frontera, Chile (ORD.: 009-2020; 27 March 2020).

Informed Consent Statement
Informed consent was obtained electronically from all subjects involved in the study.

Data Availability Statement
The data presented in this study can be shared based on specific request from the corresponding author.

Conflicts of Interest
The authors declare no conflict of interest. The funders had no role in the design of the study; in the collection, analyses, or interpretation of data; in the writing of the manuscript, or in the decision to publish the results.