You may be surprised to learn that babies can be given pediatric contact lenses at any age. The reasons why a baby may need to wear lenses would be for a serious optical defect such as extreme near sight, or high astigmatism or strabismus; the lenses will develop better sight, where glasses would be impractical. It would be extremely difficult, if not impossible, to have a young baby wear glasses continuously.
When a congenital cataract has been removed, a contact lens is inserted. If contact lenses are deemed a necessity, the baby will be measured and fitted in the same way as an adult. The lenses prescribed are nearly always daily wear rather than extended wear. These are safest as daily checking and cleaning reduce the chances of infections developing.