This is hard... I don't know what pic to choose from

... So here we go...
The first 2 pics from the left are when Cocoa was 9weeks (about 1.7 lbs).
The next 2 pics in the middle are when Cocoa was 18weeks / 3.2lbs
(His weight & size almost double!! )
The last one was taken last week, he was 22 weeks / 3.5lbs.