Very nice graphics and case. Still, the idea of a RasPi seems an overkill. I am sure you can accomplish the same result with just a Nextion display and a ESP8266. After all, you just need to run a NTP client and parse a JSON response from a weather site once in a while. And the audio can be done with a 1$ MP3 player board that reads files from a microSD. This way you can have something that is more robust, boots faster and is much less susceptible to failures caused by accidental powerloss.

Looking forward for the following updates. 

Well, I'm more at ease with a pi, since I'm definitly a software Guy... Audio part needs to be driven by the ui, and the python embedded program is already architectured to do do. I don't doubt esp specialists will achieve the same the way you describe it, for l'ESS and better boot Time, but for the moment, I don't have this knowledge. This project was more or less a POC, and is presented "as is". Anyway, thanks for tout kind comments

Thank you ! 

It has proven its effectiveness while my daughter was under three. Then she learnt how to turn TV on 🙄

I had one kid who refused to sleep, and one that refused to wake up. Then a third who couldn't sleep unless she was in motion - we spent a lot of time driving around to keep her napping.

Cracking the kid sleep problem is a hard job, especially once they get big enough to walk around the house. This looks like it might help. Good luck!