Lenses should be replaced with new lenses according to the doctor's instructions. Old lenses can become coated with protein deposits. This lessens comfort and can lead to problems. Clean lenses are comfortable and promote healthy eyes. If your child has problems inserting the lenses at first, don't despair.
Most kids become adept in no time.
Go ahead and put the lenses in for your child. With proper care, chances are minimal that your child will experience any adverse reactions from wearing contact lenses. However, most problems that do manifest are minor and are easily remedied. Advise your child to inform you if he or she experiences any eye redness, itching or burning sensations, or any vision changes. Treatment, when instituted early, will prevent complications from developing.