Children start experimenting with singing quite early and naturally. Singing does so many good things for the psyche and the spirit, little ones seem to intuitively know this (as well as those blessed by hearing them). Many observant parents ask when they should start getting vocal training for their child.
First of all, group singing experiences can be wonderfully instructive in helping a kid grow a good ear for pitch and feel for sense of rhythm. Early acting in plays and musicals help a child learn to be fearless in communicating a message. Church and school choirs, community theater for children, even instrumental lessons (piano especially) - these are great places to nurture musical talent and the ability to read music and understand the language of musicians and composers. If the instructors and directors are good and caring, these experiences can also nurture the LOVE for music and singing in kids.
Secondly, there are times a child could especially benefit from singing lessons with an intuitive vocal coach. At what age should they start? As in "most things vocal", it depends. Here are the top 5 conditions where I would recommend booking a lesson:
When they are habitually singing too loud and abusively - when they 'shout-sing' to communicate passion.
When vocal damage is suspected (they can't stop being breathy or husky, their vocal range shortens instead of lengthens, or it hurts them to sing or speak.)
When they are getting ready for a special show or audition, especially if they are performing professionally.
When they are serious and mature enough to want to sing better.
When parents would like their child's voice assessed as to strengths and weaknesses.