Board Thread:Naruto: The Last Discussion/@comment-8284722-20141205174623/@comment-1512913-20150206172309

No, since birth. His chakra is yellow as stated and shown in the manga. The anime draws generic chakra blue though, hence why his Rasengan is blue in the anime. Doesn't make sense tho for Studio Pierrot to draw his chakra mode yellow in the anime but Rasengan blue, both should have the same color. So they should have either followed the manga's yellow or stuck with their blue.