Stage 1 formula to stage 2 formula

My child is currently 8 mths old, using stage 1 Enfamil Pro A+. Thinking to switch to stage 2. As the tin recommended for stage 2 is 6mths old. But I heard many of them say to continue stage 1 until child reach maximum 12mths (accordingly to tin). Then switch to stage 2. I’m unsure if this is suitable or advisable. Also, the nutritional facts are also different correct? Pls help to clarify, as I’m not very sure what should I do.