Infant (less than 24mths) air ticket:
Its 10% of the adult published fare.
Published fare usually refers to those ticket that is valid for 1 year n r most expensive cos it has less restrictions (like u can change travel date, or keep it open date, or stopover...), does not refer to nett fare or special/promo fare which is usually valid for 1mth or 45days n has restrictions.
Infant fare does not have a seat on board, can request for bassinet. During take off n landing, you will have to carry your bb.
Child fare (24mths - 12yrs old):
75% of adult published fare. Most of the time, airlines do offer child fare even for nett fare, special/promo fare and its usually cheaper than 75% of adult fare. At this age, the child will get a seat for themselves n can request for child meal which will be served first.
If u r travelling wz babies/small children wz strollers, at Terminal 3, go to Row 4 for priority check in.