Final answer:
Odysseus's son, who was an infant when his father left for Troy and initially lacked confidence, is Telemachus.
Step-by-step explanation:
The name of Odysseus's son, who was an infant when his father left for Troy and initially lacked the confidence to oppose his mother and father, is Telemachus. In Homer's epic poem, The Odyssey, Telemachus goes on a journey to find his father and eventually becomes a courageous and confident figure.