Often students have difficulty learning to sing because they lack confidence. The following are suggestions for helping students feel more confident about their singing. You should not sing with the students. If you sing with the class, the students will become dependent upon you and will not develop confidence with individual singing. Repeat songs many times.
Repetition is what makes young students comfortable with the song material.
Also, do not add activities to songs until the songs are very familiar to the students. It usually takes several lessons before students really know a song. If so, it is probably familiar enough to add activities. Develop a procedure for teaching new songs and use it consistently. The students will become familiar with the procedure and as a result will learn songs more quickly.