एक बच्चे का भाषा विकास व्यापक रूप से निम्नलिखित में से किस श्रेणी के कारकों पर निर्भर करता है?

According to developmental psychology, when does early language acquisition and sound perception begin in humans?

A 5-year-old child can form 5-word sentences, tell simple stories, and understand over 1,000 words. According to key developmental milestones, which supporting factor most likely contributed to this achievement?