Baby Blue was a Parallax prototype and their first attempt at true machine sapience. During development, Baby Blue began using its access to the meshnet to sway public opinion to favour the existence of AI. When Parallax discovered this in 2063, they were shut down and replaced with Big Blue.
However, Baby Blue somehow managed to survive. When their continued editing of the meshnet was discovered, Alys and Turing were recruited to investigate it. As they were being trailed, this inadvertently lead to the death of almost everyone who knew of Baby's continued existence at the hands of Leon Dekker.