Hello I am getting my first lab, and it is now my time to pick. It was a very large litter of 12 choc pups (6 boys and 6 girls). There are two males that I like after seeing them. One was the first born and the other was 3rd born. At birth they were within an ounce of each other. In The following weeks the first born has consistently outgrown the other by many ounces. Now at week 5 there is about 24 oz difference between the two. Is this any cause for concern? Would this be any indication of size or just that one puppy is eating more than the other? I would prefer a 70-80lb dog vs 59-60. Both parents were around 75 to 80lbs.