Separation anxiety in babies is a normal and natural stage of development that typically begins around 8 months of age. During this time, a baby may become anxious or upset when separated from their primary caregivers. This phenomenon was first noted by the Hungarian psychoanalyst and psychiatrist René Spitz, who observed that babies at this age start to cry when their mother leaves their field of vision and may seem frightened by unfamiliar faces. This stage reflects the baby's growing awareness of their individuality and the realization that they are separate from their mother. Before 8 months, a baby is not conscious of their individuality and does not fear separation. However, at this age, they begin to understand that they are a separate person and may perceive the absence of their mother as abandonment. This period is a necessary part of the child's psychological development and does not require intervention or concern. Signs of separation anxiety include crying when the parent leaves, showing anxiety at unfamiliar faces, refusing to be held by strangers, and displaying agitation or distress when the mother is absent. This phase typically passes in a few months, as the baby begins to develop object permanence—the understanding that things continue to exist even when they are not seen. To help ease separation anxiety, parents are advised to remain calm and reassure their child. Establishing a daily routine and engaging in games that involve hiding and finding objects can be beneficial. The use of a transitional object, such as a stuffed animal or a piece of clothing with the mother's scent, can also provide comfort. When leaving the baby, parents should clearly indicate their departure and avoid leaving when the baby has their back turned. Ritualizing the departure with actions like a kiss or a hug can help the child understand that the parent is not disappearing. It is also important for parents to accept this period and not feel guilty, as it is essential for the child's development. Separation anxiety can also affect bedtime routines, with some babies crying when parents attempt to put them to sleep. Experts suggest that parents should adapt to the situation, considering the child's personality and their own experience, and gradually encourage the child to learn to sleep independently. Some children may not exhibit separation anxiety, which can indicate a secure form of attachment where the child feels confident in exploring and separating from their parents. However, even in these cases, there is a small phase of insecurity that leads to a more secure form of attachment. Books such as See you soon! by Thierry Bedouet, Line & Bulle: first vacation without dad and mom by Brigitte Carrère and Anne Cresci, by Marie Bourgonjon, and I am here and I love you by Louison Nielman and Sébastien Pelon are recommended to help prepare children for separation and provide reassurance.