Document is current

Article History

Received: 26 March 2025

Accepted: 11 August 2025

First Online: 10 September 2025

Declarations

:

: The current study used video recordings of two full-term healthy infants (1 f, 1 m), observed between 8 weeks and 25 weeks of age in supine position, and two full-term healthy infants (2 f) observed at 4 months and 1 year and 3 months of age sitting on the lap of a parent. Informed consent was obtained from the participants’ legal guardians, including consent for publication of images in an online open-access publication. The study was approved by the Committee for Research Ethics at the Czech Technical University in Prague under reference number 00000-07/21/51903/EKCVUT and was carried out in accordance with all relevant guidelines and regulations. We additionally included video recordings of four full-term infants (2 f, 2 m), observed between 6 and 18 months of age sitting or standing in front of their parents. Informed consent was obtained from the participants’ legal guardians. The study was approved by the Pavia Ethics Committee (p–20190004177).

: The authors declare no competing interests.