For parents traveling with infants, Spirit Airlines strives to provide a convenient and cost-effective experience. According to Spirit Airlines infant policy, children under the age of two can fly for free when seated on an adult's lap. This policy aims to make air travel more accessible for families with young children. Parents also have the flexibility to purchase a seat for their infant at a discounted child fare, allowing for the use of an FAA-approved child restraint system. Spirit Airlines' understanding approach extends to baggage allowances, allowing parents to bring a diaper bag on board in addition to their standard carry-on allowance, making it easier to carry all the necessities for a comfortable journey with their little ones.