Many young students have difficulty in playing with correct intonation consistently. This will improve with practice and experience. It is important to understand the concept of exact pitches, but not to worry if the student has intonation problems at first. Careful listening will help with intonation, but it is best to work on this aspect of playing with a teacher right from the beginning.
One of the most important things about learning music is developing a good sense of time. To get the student on the right track from the start, the use of a metronome is strongly recommended for daily practice.
There are various types of metronome available, from the old wind-up style to modern electronic metronome. Electronic metronomes are recommended because they are more accurate and often have a volume control as well as an earphone input so only the student need hear it.