Usually infants must be at least two weeks old before they can travel although some airlines allow seven-day old infants on board. The booking policy differs from one airline to another, so it is important to check directly with the airlines. . But three to seven months is a great window .

Traveling with a 4-month-old infant is actually considered by many experienced parents to be the "sweet spot" for early travel. At four months, babies are typically past the "newborn" fragility phase, their immune systems are slightly more robust (often having received their first major round of vaccinations), and they are not yet mobile (crawling or walking), which makes them much easier to manage in planes or hotels. Most pediatricians approve of travel at this age provided the destination has access to high-quality medical care. Key advantages include that they still sleep frequently and often find the "white noise" of an airplane cabin soothing. However, you must plan for feeding and pressure changes; breastfeeding or bottle-feeding during takeoff and landing helps prevent ear pain. You should also ensure the baby is shielded from direct sunlight and avoid destinations with extreme climates or high altitudes. While it requires more gear (strollers, diapers, formula), 4 months is generally a very manageable age for a first family adventure.