Enfamil stage 1 vs stage 2 for 7 mth old

Bb is 7 months old and i am still using Enfamil pro A+ stage 1. Should i change to stage 2? Any mummies still using stage 1 or do u all switch to stage 2 . FYI, stage 1 is for 0 - 12 mths old while stage 2 is 6 mths old onward.