How do I punctuate dimensions in this sentence that uses lbs. feet and inches?

Solution 1:

It sounds like you're writing a photo caption, i.e., words that appear underneath an image. The style for captions is generally less strict than writing a standard English sentence. You can probably write it however you want, I think the example above makes perfect sense. However, you may want to look at a style guide. For example, BuzzFeed Style Guide:

Photo Captions and Illustrations Photo captions that are full sentences or sentence fragments should be in sentence case with end punctuation; captions that are just one movie/show title or one person's name should not take a period, e.g., Killing Eve but Sandra Oh on Killing Eve.

In your case, "8’5”, 14 lbs." is a sentence fragment specifying height and weight.