Gradients across socioeconomic status occur for many children's health and improvement in high-income countries. The objective is to explore infant growth and child development in four developed countries around the socioeconomic landscape. In this paper, Structural Equation Modeling (SEM) enhances the socioeconomic status gradients for the child's developmental health. The proposed model develops the socioeconomic status is related to a huge list of health issues, including low birth weight, cardiovascular diseases, hypertension, arthritis, diabetes, and cancer, regardless of whether it is determined by income, education, or profession. This is a global phenomenon, seen in countries with low, medium, and high incomes. The size of disparities found in scores and percentiles across neighborhoods is comparable to the results of more developed growth forecasters such as sex. These results have significant consequences for the nature of tailored, efficient, and timely programs to support early childhood success.