Effective big kid child development practices involve a holistic approach that focuses on physical, cognitive, social, and emotional growth. Here are some key practices and development milestones for big kids, typically aged 6 to 12 years:

1. Physical Development: Encourage regular physical activity and provide opportunities for free play, organized sports, and outdoor exploration. Big kids should develop greater coordination, strength, and agility. Milestones include improved motor skills, increased endurance, and growth spurts.
2. Cognitive Development: Foster intellectual curiosity and critical thinking through age-appropriate activities and challenges. Encourage reading, problem-solving, and creative pursuits. Milestones include enhanced memory and attention span, expanded vocabulary, and improved logical reasoning skills.
3. Social Development: Promote positive peer interactions, teamwork, and empathy. Encourage participation in group activities and help develop conflict resolution skills. Milestones include increased independence, the ability to cooperate, and understanding different perspectives.
4. Emotional Development: Support emotional well-being by creating a nurturing and supportive environment. Encourage open communication and teach emotional regulation skills. Milestones include developing a sense of self-identity, empathy, and the ability to manage and express emotions appropriately.
5. Milestones: Big kids will experience a wide range of developmental milestones during this period. These may include improvements in language and communication skills, advancing problem-solving abilities, increased self-awareness, the formation of close friendships, and a growing sense of autonomy and responsibility.

Remember that every child is unique and may progress at their own pace. It is essential to provide a supportive and encouraging environment while respecting their individuality. Regularly monitor and celebrate their achievements, fostering a positive mindset towards growth and development.