My baby eyesight +4/-2.25, what does it means?

Went for routine checkup to pediatric opthamoligist (eye specialist), doctors has checked has suggested she has power of +4.00/-2.25 180, and suggested to have specs from now, my baby is only 8 months old, and will not able to hold & keep her specs, can anybody suggest what is the meaning of +4.00/-2.25 eyesight, and is their any other method to reduce power, ?