There is no clear conclusion on how long the lack of security lasts in newborns. It is recommended that parents communicate more with their babies to increase their dependence on them and establish their babies’ sense of security as early as possible. The newborn is in the mother’s womb at the right temperature, with a small range of motion, and the body is always curled up so that it can hear the mother’s heartbeat and the sound of the blood vessels in the abdomen. After birth, the temperature, humidity, air and sound that they are exposed to have changed, they cannot hear their mother’s heartbeat, their arms and legs are spread out, and they are prone to lack of security. There is no clear data on how long a newborn’s lack of security can last. Parents are advised to hug and touch their babies more often, and breastfeeding is the best way to build a baby’s trust and sense of security, which can effectively reduce a baby’s anxiety and fear. Parents can also listen to soft music and interact with their babies in games, and babies often hear their mother’s voice, which also helps to enhance the sense of security.