Brain tumors in children are a different entity then the tumors in the adults as often they may be curable by surgery alone usually called “pilocytic astrocytoma”. These tumors are probably only tumors that can technically be called curable by surgery.
Another extreme is a malignant tumor often known as Medulloblastoma and the other range of tumors as in adults in between.
The usual presentation of an infant or child is usually with persistent crying, increasing head size vomiting, and altered sensorium, often unconsciousness and even death if neglected.