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It depends of the nature of the lie.
When the truth is revealed and child sees that we have lied, it decreases our authority in his eyes and his trust to us.
The Placebo effect works really good on children
If it's a white lie, it may make the child happier.
Never. Nor should they be indoctrinated into any religion before the age of 10, as it has been proven that this damages their ability to differentiate reality from fiction, as well as their self-esteem.
Only in very rare cases where it could seriously effect the child's well being or mental/physical health, and even then steps should be taken to be as truthful as possible and to work towards being able to tell the truth, as even kids have a right to the truth
Children easily get the truth in the wrong throat
E.g. If they ask why you (respect person) won't play with them
If you say this game is to childish for you they will think they are wrong for liking it even if it fits their very state of development
This would teach that lying is OK if the truth ever came out. Withholding information would be a better decision.
Children are also people and also has a human right to know, they need to know to understand the world.
For most important things, they will probably quickly learn the truth, cancelling most of the reason to lie.
If they learn you lied, it will probably hurt their feelings and the relationship with them.
One lie rarely come alone, to protect a lie you will probably have to lie about other things.
You could even end up in the dark side of epistemology.
It depends of this age of the child
They do not understand the compexity of the world so it's easier to lie to them.