My baby is 6 months old, should we give him Jumpstart 2?

Hello, A few weeks after my son was born, we switched to Good Start Smooth instead of the regular milk because he was having a lot of stomach pain. The change worked well. He is now 6 months old, so we normally have to change to stage 2 of Good Start. I thought before I went to step 2, I would try the regular step 1. Unfortunately I went back to the smooth formula because he started to have severe stomach pain again. The situation is now restored with the Smooth formula. Since he is now 6 months old, I should probably switch to Step 2 of Good Start.