A baby's anterior fontanelle is a diamond shaped space between the parietal and frontal bones. It ossifies and closes at around 18 months. Before that, it can provide important clues to diagnosis in a child. Listed above are some causes of a bulging anterior fontanelle. Any etiology that raises the pressure inside the skull will prevent fontanelle closure. They may be infectious, traumatic, metabolic, or endocrine in nature. Space occupying lesions such as tumours, cysts and even hydrocephalus can lead to this condition. https://theofy.world/gallery/what-causes-a-swollen-fontanelle