My interpretation of what the parent meant is that the cognitive processes which support language acquisition (which may be mostly domain-general) are already o

My interpretation of what the parent meant is that the cognitive processes which support language acquisition (which may be mostly domain-general) are already optimized for this task, for which there is a sensitive period during certain years where you need to be exposed to certain inputs, or else you never fully acquire language. See: https://en.wikipedia.org/wiki/Genie_(feral_child) https://en.wikipedia.org/wiki/Genie_(feral_child)