As the nervous system develops normally it exhibits certain reflexes. Babinski reflex is one of a number of neonatal reflexes (such as Moro reflex, Landau's reflex, blink reflex, etc.). As the nervous system becomes more complex, a number of those reflexes go away and others are retained. Babinski reflex is one that goes away and is replaced by the plantar reflex.
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Honor Society of Nursing (STTI) answered
At birth the Babinski reflex is positive, due to the immaturity of the nervous system. As the nervous system matures, the Babinski reflex becomes negative. The Babinski reflex usually disappears around one year of age. If the Babinski reflex persists beyond the second birthday, it may be a sign of a nervous system disorder.