HOW DOES DOS DEVELOP?
Once the systems of foetuses get functional, based on the instinct of optimizing operations (a consequence of the evolutionary process), the rudimentary part of their mind formation begins, as they start receiving sensory information, using which, in conjunction with the genetically inherited biological structure evolved for such use, their brains begin to develop DOS.
After birth, there is gradual increase in receiving sensory information, as their interaction with the external world increases gradually, resulting into gradual increase in processing the same. This is well suited for them, as their brain is also developing gradually.
To deal with the world around themselves, they learn to imitate others via the knowledge gained when they interact with them, which they do instinctively based on second type of hard-wired interactions
(more under title Hard-Wired Interactions). To interact with similar experiences when others are not around to guide them, they use their memory to recall how they would have interacted to the same or similar situation and interact accordingly.
Putting it differently, with their own physical structure, i.e. their body, being similar to those whom they are imitating from, they learn how to manipulate it by imitating their behaviour to interact in similar situations.
Initially through behaviour using gestures, and later, they start receiving instructions from others verbally, which they map with their intramural communication, giving it language. Though at such stage, the scope of language is limited to correlating words with actions, and not processing intramural communication to generate language, i.e. for "extramural communication".