To find the height of the infant son, you divide the father's height by 14.
The father is 623 feet tall, so:
\[ \text{Son's height} = \frac{623 \text{ feet}}{14} \approx 44.5 \text{ feet} \]
Now, to convert 44.5 feet into a fraction:
44.5 can be expressed as \( \frac{89}{2} \) feet.
This means the height of the son is not present among the responses provided. Please check the heights again or clarify the problem details, as it's likely there was an error in interpreting the heights or units.
If you meant that the father is 6 feet 23 inches, please clarify, and I can recalculate based on that information.