Countess Viola Arrivabene-Valenti-Gonzaga and her husband Charles Siem had their first child, a daughter Ada Mafalda on December 21st 2023
Source: Her Instagram
Rather born earlier than today :https://www.instagram.com/p/C1H1L53sHOa/
Update: the youngest child of Archduke Christoph and Archduchess Adelaide is a girl; her name is Flavia:
https://heinbruins.nl/FraKa.html