Yes, a 3-year-old can absolutely sit in business class. Airlines allow children of all ages to travel in any cabin class, provided they have a valid ticket.
However, there are some important practical and financial considerations for parents:
Pros: More Space: The extra room is invaluable for a wiggly toddler and makes it easier for them to sleep (often in a fully flat bed on long-haul flights). Quieter Environment: Generally calmer than economy, which can help a child settle. Better Service & Amenities: Priority boarding, premium meals (you can often request a child’s meal in advance), and amenity kits can make the journey smoother. Privacy: Some business class suites with doors offer more containment and privacy for family moments.
Cons: