By mistake , have purchased stage 4 similac powder. Can it be given to 4 months infant ?

A. Stage 1 and stage 2 formulas You can use stage 1 formulas from 0-12 months old. From 6 months, you can choose stage 2 or follow-on formula, but you don't need to change to stage 2. These formulas aren't better for your baby than starter or stage 1 formulas