3 "... I will have you swear by the Lord, God of heaven and God of earth, that you will not take a wife for my son from the daughters of the Canaanites among whom I live,
4 but will go to my land and my family to take a wife for my son Isaac.”
Abraham's instruction was clear. The servant was to find Isaac a wife, not a child for whom Isaac would have to wait many years before she would be ready to marry. We see from the servant's response that he understood who he was to search for (italics mine):
Once again the text is clear. Rebekah is a young woman, not a toddler. Remember that your typical three year olds cannot carry heavy jugs of water on their shoulders. Their bodies are just too small and weak for this type of labor.
Note as well the phrase "a young woman who had not known a man intimately." Again, this is not a phrase one uses to describe a three year old.
22 After the camels had finished drinking, the man took a gold ring weighing half a shekel, and for her wrists two bracelets weighing 10 shekels of gold.
24 She answered him, “I am the daughter of Bethuel son of Milcah, whom she bore to Nahor.”
27 and said, “Praise the Lord, the God of my master Abraham, who has not withheld His kindness and faithfulness from my master. As for me, the Lord has led me on the journey to the house of my master’s relatives.”