Infants under the age of 24 months have an abstract sense of time. They do not yet have any feeling for how long a minute or an hour lasts.
It is only between the ages of three and four that children slowly begin to deal with numbers and time.
In this respect, the purchase of a children's alarm clock is worthwhile from the time the child enters kindergarten.
From this age, children learn to develop a sense of time independently thanks to a child-friendly alarm clock.