Most major cruise lines in 2026, including Royal Caribbean, Carnival, and Holland America, strictly enforce a pregnancy cutoff of 23 weeks. Specifically, guests are generally not permitted to sail if they will enter their 24th week of pregnancy at any point during the voyage, including the final day on board. This policy exists because cruise ships have limited medical facilities and are not equipped to handle neonatal emergencies or preterm births. To ensure compliance, pregnant travelers are usually required to provide a physician's letter upon embarkation. This letter must state that both the mother and baby are in good health and fit to travel, and it must clearly include the estimated date of delivery (EDD) calculated by both the last menstrual period and an ultrasound.