Children are capable of lying from a very early age, usually around the 3-year-old mark. The reasons why a child decides to lie, whether consciously or otherwise, can be quite varied, but the fact remains that lying is a common practice among children. ❗ Important: If you’re dealing with a child who is lying, it’s important to not call them a liar or label them as such. Doing so is detrimental to their development and it might end up reinforcing a pattern where lies become more common.