The imagination of a 2-and-a-half-year-old child is still in its infancy, and the boundary between reality and imagination is still blurred for her. Sometimes she doesn't even know what she says to her mother. Is it true or imaginary? First, make sure she hasn't been hurt in any way. According to you, the baby was kissed by the teacher in the next class. She didn't know how to express it, so she thought it was "bitten". In addition, being a strange teacher will have psychological fear, which should be understood and protected. Please ask the teacher in your own class to take care of her, and don't let the teacher in the next class contact her again, at least not for a short time, so as to relieve the baby's psychological anxiety. If it still doesn't work, don't take her to the early education center again. After all, it's not a regular school, so it doesn't matter. Promise the baby that if someone really hurts her, mom and dad will protect her. Tell her again that kissing is not an injury, but a cold and fever, which has nothing to do with it. For example, if mom and dad like her, they will kiss her. But if a stranger wants to kiss her and she doesn't want to, she can refuse, say "no", leave and find a familiar teacher or parent. It is also important to teach her to refuse others and protect herself.