Introduction: Age-appropriate feeding in the first two years of life is essential to a child’s growth and development, with health implications that persist throughout life. This study examined the adherence to age-appropriate feeding practices among children 0-23.9 months old based on a constructed index, its association with anthropometric growth, and factors affecting adherence. Methods: A total of 9,138 children aged 0-23.9 months with complete information on infant and young child feeding practices (IYCF), anthropometric measurements, maternal information, and household characteristics were included in the study. Data were extracted from a nationwide survey conducted in 2018-2019. Results: Among children aged 0-23.9 months, 20.7% adhered to age-appropriate feeding criteria. More than half (57.7%) of children below six months adhered to age-appropriate exclusive breastfeeding practices, while 1.4% of children aged 6-8.9 months old started complementary feeding. Continued breastfeeding at 12 months of age while receiving complementary feeding was uncommon (11%). Significantly higher z-scores for weight-for-age (-0.6±0.04), height-for-age (-0.8±0.05), and weight-for-height (-0.2±0.05) were noted among children who adhered to age-appropriate feeding practices compared to those who did not. Child’s age and birth weight, as well as mother’s age, education, and working status, were found to significantly influence the likelihood of adhering to age-appropriate feeding index. Conclusion: Filipino infants and young children under two years of age have low adherence to age-appropriate feeding practices, putting them at a higher risk of repeated occurrence of infection that could lead to stunting in early life.