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During childhood, the development of a child involves several key aspects. Firstly, the physical development aspect encompasses the skeletal and muscular systems, as well as the development of motor skills. Secondly, health and safety become important focuses by providing adequate physical exercise to meet national targets and prevent children's inactivity. The processing of information and intelligence in cognitive development emphasizes repetition, organization, comparison, and the emergence of information. The division of intelligence into emotional and spiritual intelligence provides an additional dimension to understanding child development. Piaget's approach, particularly the concrete operational stage, describes a phase in which children use operations and logical reasoning in concrete situations. Lastly, in cognitive development, language becomes an important tool for communication, both in oral and sign forms.

Discussion of language acquisition cannot be separated from the factors that influence it. Language acquisition is a process of acquiring a child's first language without any special learning about language. A child will only respond to utterances that are often heard from the surrounding environment, especially utterances from the mother. In the process of acquiring language, a child cannot be separated from communication activities involving the interlocutor. In this study researchers conducted research on language acquisition, especially on a 5 years old child. This research was conducted with the following objectives; 1) To describe language acquisition in the components of syntax acquisition, semantic acquisition, phonology acquisition, and morphology acquisition in 5 years old child; 2) To describe the factors that influence 5 years old child language acquisition. The results of this study show that language acquisition at the age of 5 a has reached four components, namely syntax acquisition, semantic acquisition, phonology acquisition, and morphology acquisition. Apart from that, there are three factors that influence the language acquisition process as follows; 1) natural factors; 2) cognitive development factors; and 3) social background factors

Growth and development is a continuous process that occurs from conception and continues until adulthood. The pre-school period is a golden age where stimulation of all aspects of development plays an important role in subsequent developmental tasks, where 80% of children's cognitive development has been achieved at pre-school age. However, in reality there are still many parents who do not understand the importance of screening and stimulating growth and development in children. Screening is carried out to detect irregularities early so that it will be easier to overcome them. Currently, the KPSP Pro application is available, which can be accessed via smartphone, which can be used by parents to carry out independent developmental screening of their respective children. The problems currently faced by partners are the minimal knowledge of parents regarding screening and stimulating growth and development in children, the lack of utilization of the facilities that are already available for conducting screening, many parents who are not open to technology, and do not understand how to access and use applications. KPSP Pro is also unable to utilize information from screening results. The solutions offered to partners are: conducting seminars for teachers and parents regarding the importance of screening and stimulating growth and development in children, informing regarding the availability of the KPSP Pro application, teaching how to access/download the KPSP Pro application, conducting roleplays, carrying out development screening using KPSP Pro and provide an understanding regarding the use of screening results. The results of this activity showed an increase in mothers' knowledge about developmental screening of preschool-age children.

Community service activities are carried out at Bintang Timur Kindergarten in Pematang Siantar in order to help children at an early age understand android educational games that are suitable for consumption by the child himself. Educational games as a support for children's cognitive development so that parents must understand various types of educational game applications, how to choose the right educational games, and how to install on cellphones. The implementation method used is presentation, demonstration, practice, brainstorming, and sharing about educational games to the Principal at Bintang Timur Kindergarten, Pematang Siantar.  This activity was carried out through three stages, namely 1) socialization, 2) mentoring, 3) monitoring and evaluation. The results of the implementation of this activity are:  1) understanding of android educational games as a support for children's cognitive development in the very good category.  This is indicated by the percentage of indicators of achievement of recognizing educational games (96%), choosing educational games (89%), installing educational games (93%), and implementing educational games (86%); 2) obtained a positive response as seen from the attendance indicator of participants reaching 93% of the target and enthusiastic participants during the activity from the beginning to the end of the activity. The ultimate goal of introducing educational games is that parents are IT literate so that they are able to monitor their children in using cellphones, especially when playing games.

  All forms of violence and crime, including intolerance, bullying and sexual violence, are not appropriate in an educational setting. So it is necessary to take concrete steps from the school to eradicate these three behaviors from the educational environment. Through a phenomenological approach to the declaration of the three grave sins of education, the results of the study reveal: that religious moderation can be a solution to overcoming the three great sins of education: intolerance, bullying, and sexual violence. By making religious moderation an educational strategy in schools, these three grave sins can be prevented and removed from the educational environment. This research contributes to the development of the school curriculum, especially the cognitive development of adolescents as well as the prevention and treatment that must be carried out.

The rapid development of the times, the revolution has changed many things that must be kept, not to be ignored. Traditional games that are full of cultural and ethnic values, even those that are useful for the best development of children. Modern games that are considered more realistic and even more personal are preferred by children, must be exposed to better motoric and cognitive games. In this study, the theory used is Herbert Spencer's cultural theory which considers that people and culture experience changes at certain stages from simple to complex forms. In addition to the concept of children's motor development according to John Piaget, who has found that games will train children's cognitive abilities better. This research is to see how the existence of traditional games influences the development of children today. This study uses qualitative methods to see how children make traditional games into modern games for children's motoric and cognitive development. As a result, children who do traditional games have much more developed abilities and character. The role of parents and teachers Traditional games that hold meaning and tradition are also important to be preserved. The results of the research itself can be concluded in the game Gobag Sodor there are cultural values that have been applied in the game and there are components of physical conditions that exist in learning at school and in college, such as agility, speed, coordination, strength and balance.

Gadgets have an important role in human life. In addition, the gadget also has a negative impact on its users. This negative impact is caused by use not in accordance with the actual function, especially children. The purpose of this service activity is 1) to provide information about children's cognitive development, 2) to provide information regarding technological developments and their impact on child development, and 3) to provide information on the impact of gadgets on children's development and solutions for dealing with children who are addicted to gadgets. The methods used in this dedication are lectures, discussions, problem solving solutions. This dedication activity was carried out at Plus Muhammadiyah Pancor Elementary School. The results of this dedication show that the participants were enthusiastic and active in discussion activities during the activity.

Early childhood is the age when a child is experiencing significant cognitive development. Providing the right stimulus in the form of role useYouTube is one effort to optimize children's cognitive development. The purpose of this research is to know and understand the roleYouTube in optimizing the cognitive development of Group B early childhood on the theme of vehicles at RA Salafiyah Cibenda Pangandaran Regency. The research method used is a qualitative-descriptive approach. The subjects in this study were students, teachers and parents from Group B at RA Salafiyah. Data collection techniques were carried out through observation, interviews and documentation. The results of the study show that the roleYouTube can optimize children's cognitive development. This can be seen from the developments that occur in the aspects of attention, concentration, imagination, curiosity, memory, and language, in early childhood regarding the role of usingYouTube group B on the theme of Vehicles in RA Salafiyah Cibenda Pangandaran Regency.  

This study aims to find out what challenges parents face in online learning and to what extent parents are ready for online learning to take place. The research method used is a systematic literature review (SLR). The results of the study show that the challenges faced by parents in online learning include time constraints, learning atmosphere, digital literacy, facilities and infrastructure, gender, children's social development, children's health, and parents' social status. The results of the study also show that parents are not ready for online learning to be implemented. Future research needs to look at parents' views on children's cognitive development in online learning and develop appropriate learning platforms so that teacher-student-parent communication can be well established in online learning