Several factors contribute to developmental variability:
1. Genetics: A child's genetic makeup plays a significant role in their developmental trajectory. 2. Environment: Environmental factors such as exposure to toxins, nutrition, and early stimulation can influence development. 3. Prenatal Factors: Conditions during pregnancy, such as maternal health and prenatal care, can impact a child's development. 4. Health Conditions: Chronic illnesses or developmental disorders may delay certain milestones.