Thanks for using the forum. I am happy to address your questions, and my answer will be based on the information you provided here. Please make sure you recognize that this forum is for educational purposes only, and it does not substitute for a formal office visit with your doctor.
Without the ability to examine your sisters daughter and obtain a history and review her imaging, I can not tell you what the exact cause of her symptoms is. However I will try to provide you with some useful information.
In
infantsInfant apap
Infant formulas
Infant of diabetic mother
Infant pain reliever
Infant test/procedure preparation
Infants tylenol concentrated drops
Infants' gas relief, and in people in general, bleeding in the brain can occur due to what is termed
vascularArteriosclerosis of the extremities
Birthmarks - red
Dementia
Heart disease
Intravascular ultrasound
Mesenteric artery ischemia
Renovascular hypertension
Replantation of digits
Stroke
Tobacco and vascular disease
Vascular headaches malformationsImperforate anus
Imperforate anus repair
Pulmonary arteriovenous fistula. There are several types of these, but to summarize, they are either malformed veins or malformed connections between arteries and veins in the brain. Another cause of bleeding in the brain is
ruptureAortic rupture, chest x-ray
Ruptured eardrum
Tracheal/bronchial rupture of an aneurysm, which can occur in infants though this is rare. When a bleed occurs in the brain, they can lead to increased pressure around the brain, and this can lead to intractable vomiting. These vascular malformations occur during development, in most cases a specific cause is not identified, and a trigger for the bleeding also may not be identified. Treatment depends on the exact nature of the blood vessel abnormality, but the most appropriate care is often delivered in an intensive care unit. If a vascular malformation is present, surgical treatment or a procedure called embolization may be needed to prevent re-bleeding.
Discussion of your questions with the child's pediatric neurologist is important so you can understand what caused the bleed and what the treatment plan is.
Thank you for this opportunity to answer your questions, I hope you find the information I have provided useful, good luck.