No expert but the way I understand it, it has to do with cognitive ideation. Basically before that age you have already attached names and meaning to the world around you(mom, dad, ball, dog) but to grasp the time since you’ve done said recognition of your surroundings and it’s sequence over time has not been fully achieved it’s only after 4/5 years old you firm that time line. Again, no expert. Please correct me if I’m wrong here experts.
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