Riddle, scared the baby to death, 24 solar terms

Analysis:

Child, buckle "baby"

Cold-when used as a word, it means fear, and the button is "scared to death"

Slight cold, one of the twenty-four solar terms, marks the official start of the season and winter, and the sun reaches 285 degrees of the yellow meridian. For China, a slight cold marks the beginning of the coldest day of the year.