Yes, tickets can be booked for infants. However for an infant to travel there are certain requirements to be met. These requirements are as follows:
The infant should be accompanied by an adult with a minimum age of 18 years.
The infant must be below the age of 2 years when travelling (at completion of journey).
You can only book for one infant per adult.
When travelling, every passenger accompanying an infant should carry a valid passport or endorsed on the parent’s passport as a valid travel document.