Norwegian is taking advantage of the opportunity to gain extra revenue without the threat of losing customers as the majority of competitors already charged similar rates for infants.
Norwegian Cruise Line was the only major cruise line to not charge for children aged 6 months to 2 years old. However NCL has changed their fares for the young ones and they will be priced the same as other 3rd and 4th persons in a cabin. Newborns that are not yet 6 months old are not allowed to cruise.
The first two passengers in a cabin are priced the same regardless of age on Norwegian. Additional berths in the same stateroom will be at a discounted price, plus port fees and taxes.