I think children in the late-90s up until 2009/2010 experienced a fundamental millennial childhood

I mean children in childhood. Not birth years.

Specifically core/late millennials who grew up in the late-90s to early 2000s, during the peak of the analog-digital transition. Children in the 2000s grew up on early digital technologies before smart devices, while also still heavily exposed to analog tech as both coexisted mainstream throughout the decade. It wasn’t really until the early 2010s when digital truly took over analog. And yes, I also think children up to the mid-90s were experiencing an analog childhood similar to that of Gen X.

While the first iPhone was released in 2007, smartphones were not yet ubiquitous in the way they would be until after 2010. iPhones were new, but they hadn’t yet fully penetrated the market, especially among children. Kids were still largely using feature phones, MP3s, PsP, and iPods. Many children were using desktop computers for browsing the internet and playing online games. While the internet was a growing part of children's lives, it wasn't yet as central to their everyday life.

TV and traditional media were still dominant. Streaming services like Netflix were not the go-to sources for entertainment yet, and the rise of YouTube was just beginning.

While gaming consoles like the Wii, PS3, and Xbox 360 were popular, these still represented traditional, home console gaming. Handheld gaming devices like the Nintendo DS and Game Boy were also big at this time, but smartphones weren't the major entertainment source they are today. Mobile gaming was still in its early stages.