Emotion regulation is one of the most fundamental psychological processes in child development, which plays an important role in organizing behavior, social adjustment, mental health, and the formation of interpersonal relationships. This process refers to the set of abilities through which a child manages the intensity, duration, way of experiencing, and the way he expresses his emotions in accordance with the environmental conditions and individual goals. Emotion regulation does not mean suppressing emotions or preventing the experience of unpleasant emotions, but rather involves identifying, understanding, accepting, and modulating emotional responses in an adaptive manner. Childhood is considered a critical stage in the development of this capacity due to the gradual development of neural networks, the development of cognitive abilities, the formation of language skills, and relative dependence on caregivers for emotional relaxation. In the first years of life, the child needs direct adult support to manage fear, anger, frustration, and discomfort, and gradually acquires a greater ability to regulate emotions independently through interaction with caregivers, observing behavior patterns, experiencing emotional consequences, and learning cognitive skills. The quality of this process can affect the way a child responds to everyday pressures, interpersonal conflicts, academic failures, and social situations. When a child has difficulty identifying emotions, tolerating discomfort, inhibiting impulses, or choosing appropriate coping strategies, the likelihood of behavioral problems and internalized symptoms may increase. Behavioral problems typically refer to patterns of overt and disruptive behaviors that can include aggression, persistent disobedience, impulsivity, coping behaviors, and difficulty following social rules. In contrast, internalized problems are more likely to manifest in the form of internalized emotional experiences such as anxiety, excessive worry, sadness, social withdrawal, feelings of worthlessness, and physical complaints associated with psychological distress. Although these two groups of problems differ in the way they occur, they can overlap in terms of emotion regulation processes and can be observed simultaneously in some children. For example, a child who is weak in tolerating failure may engage in aggressive behaviors when faced with limitations, while another child with similar difficulty may internalize his anger and sadness and experience worry, avoidance, or social withdrawal. Therefore, emotion regulation can be one of the important variables for explaining individual differences in children's responses to stressful situations. From a theoretical perspective, emotion regulation is related to several cognitive, biological, and social mechanisms. The development of executive functions, including response inhibition, working memory, cognitive flexibility, and the ability to plan, helps a child to create a gap between the initial emotional experience and his or her behavioral response. For example, a child who has developed a better ability to inhibit a response may have more opportunity to assess the situation and choose the appropriate behavior when angry rather than immediately. Cognitive flexibility also allows the child to examine the situation from different angles and distance himself from dry, one-sided interpretations. In contrast, difficulty in these processes may lead to persistence of intense reactions, hasty decision-making, and an inability to change coping strategies. However, emotion regulation cannot be reduced to executive functions alone, as motivation, learning, social relationships, physical status, and environmental characteristics also play a role. From a neurobiological perspective, emotion regulation is the result of the interaction of neural networks related to the processing of emotional stimuli, threat assessment, cognitive control, and learning. Structures such as the amygdala, parts of the prefrontal cortex, and networks associated with attention and memory are involved in this process, but a child's emotional function is the product of the coordinated activity of a set of brain networks, not the individual functioning of an area. The development of these networks continues throughout childhood and adolescence, and because of this, children may need external support for emotion management more than adults in stressful situations. Insufficient sleep, constant stress, fatigue, and poor environmental conditions can also affect a child's capacity to regulate emotional responses temporarily or permanently. In this framework, emotion regulation is not a fixed trait of personality, but rather a developmental and changeable capacity that can be strengthened with appropriate education, experience, and support. An important dimension of this process is the ability to recognize and name emotions. A child who is unable to identify his or her emotions correctly may experience or express sadness, fear, shame, or frustration simply in the form of anger. For example, a child who is afraid of peer ridicule may exhibit confrontational or aggressive behavior before he is able to express his fear and feelings of vulnerability. In such a situation, teaching emotional vocabulary and helping the child to associate emotions with physical cues and stimulating situations can be effective in increasing emotional self-awareness. The ability to name emotions also helps the child to ask for support in a clearer way and express their needs through verbal communication rather than using disruptive behaviors. However, emotion recognition alone is not enough and should be accompanied by distress tolerance skills, problem-solving, and choosing the appropriate behavioral response. In the context of behavioural problems, poor emotion regulation may be linked to aggression and disobedience through reduced impulse inhibition, increased sensitivity to frustration, and difficulty assessing the consequences of behaviour. Some children experience intense emotional arousal in situations where they feel ignored, constrained, or their demands are opposed, and have less opportunity to choose a measured response. If aggressive reactions repeatedly lead to task stopping, adult withdrawal, or receiving attention, they may be reinforced through environmental consequences and become a recurring pattern. In this situation, mere attention to the appearance of behavior without examining emotional stimuli, coping skills, and environmental consequences can generate an incomplete understanding of the problem. Specialized evaluation should determine in which situations difficult behaviors occur, what emotions are experienced before them, and how the reaction of those around them affects the frequency or reduction of the behavior. Also, aggression is not always caused by poor emotion regulation, and other factors such as developmental problems, attention disorders, environmental pressures, learning difficulties, and adverse experiences may also play a role. In internalized problems, emotion regulation is associated with symptoms of anxiety and depression in different ways. Children who have difficulty tolerating unpleasant emotions may turn to avoidance, frequent reassurance, or social withdrawal to immediately reduce anxiety. These strategies sometimes create a sense of calm in the short term, but if persistent, they can reduce the opportunity to learn coping skills and correct threatening perceptions. In children prone to worry, constant attention to the possibility of negative events and an inability to accept uncertainty can prolong the experience of anxiety. In children with depressive symptoms, rumination, self-blame, and difficulty shifting attention from negative experiences may be associated with persistence of sadness and reduced participation in enjoyable activities. Some children do not express their unpleasant emotions openly and instead experience headaches, stomachaches, fatigue, sleep disturbances, or decreased willingness to attend school. These symptoms should be evaluated in the context of physical, environmental, and psychological conditions, and they cannot be attributed to emotional problems without adequate consideration. On the other hand, constant suppression of emotions or an extreme attempt to hide discomfort may be associated with increased internal pressure and difficulty in seeking help in some children. Individual differences in emotion regulation can explain why children react differently when faced with similar pressures. Some children have higher emotional sensitivity, some have difficulty regaining calm after experiencing failure, and others show more limitations in identifying emotions or choosing the appropriate strategy. These differences alone are not a symptom of impairment, as emotional development is influenced by age, mood, learning experiences, and support opportunities. Therefore, the prediction of behavioral and internalized problems based on emotion regulation should be done according to a set of individual and environmental variables. Emotion regulation may play the role of a risk factor, a protective factor, or a mediating variable in some research models; for example, adverse family experiences may be associated with an increase in anxiety symptoms through their impact on emotion regulation skills. However, determining the exact role of this variable depends on research design and empirical evidence, and the correlation between emotion regulation and psychological problems alone does not prove a causal relationship. From a family perspective, the way caregivers respond to a child's emotions plays an important role in learning emotion regulation. Parents who recognize a child's emotions, accept them without humiliation or blame, and at the same time set clear behavioral boundaries provide a good opportunity to learn emotion regulation. In contrast, constant disregard for emotions, punishment for expressing emotions, unpredictable reactions, or patterning impulsive behaviors may make this process more difficult. However, families should not be seen as the sole cause of a child's problems; economic pressures, environmental conflicts, family members' physical and mental health, and access to support also play a role in the quality of interactions. Parental support is most effective when a balance is struck between emotional acceptance and behavioral guidance, i.e., the child is allowed to express his anger or sadness, but at the same time learns that harming himself or others is not an acceptable strategy for expressing these feelings. School is also an important environment for developing emotion regulation and identifying problems related to it. Peer relationships, academic success or failure, conflict management by teachers, and a sense of belonging to the educational environment can affect a child's ability to manage emotions. Social skills training, conflict resolution, empathy, tolerance of failure, and seeking help can play a role in preventing the escalation of behavioral and emotional problems. However, observing a difficult behavior at school should not lead to a child's labeling, as his or her behavior may reflect fatigue, learning difficulties, family pressure, or inconsistency between developmental needs and environmental expectations. Careful assessment requires gathering information from multiple sources, including the child, parents, and teachers, and examining differences in behavior in different situations. Practically, an emotion regulation measure should go beyond assessing the intensity of anger or sadness and should include the ability to identify emotions, tolerate distress, use coping strategies, cognitive flexibility, and restore emotional balance. Standard assessment tools can help to better understand the child's situation, along with clinical interviews, behavioral observation, and environmental information, but no questionnaire alone is sufficient to diagnose the disorder or predict the future definitively. Also, the assessment should be done according to the child's age, level of language development, cultural differences, and neurodevelopmental characteristics. In the area of intervention, emotion regulation skills training can be part of cognitive-behavioral programs, family-centered interventions, and school-based social-emotional programs. These trainings can include identifying emotions, recognizing physical symptoms, stopping before reacting, breathing slowly, cognitive revision, problem-solving, tolerating failure, and practicing effective communication. In younger children, games, stories, paintings, and dramatic activities can convey emotional concepts in a way that is appropriate for the child's development. In older children, recording emotional situations, examining the relationship between thought and feeling, practicing alternative responses, and gradually facing difficult situations can help develop coping skills. In children with prominent behavioral problems, in addition to individual skills, the intervention should also examine patterns of reinforcement of behavior, consistency of rules, and the way adults respond . In children with internalized symptoms, it is especially important to provide opportunities to express emotions, reduce avoidance, and strengthen social participation. The treatment plan should be designed based on individual needs, and in cases where the symptoms are severe, persistent, or disruptive, an evaluation by a child mental health professional is necessary. Among the limitations of research in this field, we can mention differences in the definition and measurement of emotion regulation, reliance on parental reporting or self-reporting, heterogeneity of research samples, and difficulty in determining the direction of the relationship between emotion regulation and psychological problems. Poor emotion regulation may increase the likelihood of problems, but anxiety, depression, or behavioral problems can also reduce the capacity for emotion regulation. This two-way relationship shows the necessity of using longitudinal research and multi-source evaluations. In addition, a strategy that is adaptive in one situation may not work in another; for example, taking a short break from a stressful situation can help restore calm, but constantly avoiding essential life situations may keep the problem at bay. Therefore, the goal of emotion regulation training should not be to impose a single strategy on all children, but rather to emphasize the ability to choose the appropriate response to the situation. Overall, emotion regulation is one of the important processes associated with predicting behavioral problems and internalized disorders in children, as it affects how we interpret events, control responses, tolerate stress, and the quality of social interactions. However, this process works in interaction with mood characteristics, cognitive development, family circumstances, educational environment, and life experiences, and cannot determine a child's psychological fate alone. Accurate recognition of emotion regulation mechanisms and their reinforcement through family, school, and specialized services can help identify problems early, reduce maladaptive behaviors, prevent exacerbations of anxiety and depression symptoms, and promote children's mental health. An approach that recognizes individual differences and focuses on the development of coping skills, a sense of security, and the ability to build healthy relationships, along with reducing symptoms, can pave the way for better adjustment in the later stages of life.