Buying a ticket for an infant can be a little confusing, as you may be uncertain about which type of flight ticket to buy for your child. Infants aged between 0 and 2 won't need to pay for a flight ticket on most flights, as they can sit on a parent's lap.
If you wish to add an infant to your booking, then select the '+' button next to the infant section. Although the price of a flight ticket for an infant might be free, it allows the airline to track how many people will be on board and what facilities will be needed. If you're travelling with an infant, you can request a cot or a bassinet, depending on the airline you're flying with.
Every airline has its own policies on newborn age restrictions, fees for bassinets and car seats, and booking procedures for both.
In no circumstances are infants allowed to travel alone.