Sure, there's lots of inbuilt stuff like basic needs and emotions. But still, baby doesn't know anything about the world. It's the ability to collect data and train on it that makes it AGI.
That's wrong. It knows how to process and signal low carbohydrate levels in the blood, and it knows how to react to a perceived threat (the Moro reflex).
It knows how to follow solid objects with its eyes (when its visual system adapts) - it knows that certain visual stimuli correspond to physical systems.
Could it be that your concept of "know" is defined as common sense "produces output in English/German/etc"?