Hello, thanks for the query to H.C.M.C
, in majority of cases gastroesophageal junction herniate from lower part of oesophagus through diaphragm.
In few cases part of stomach bulge out.
In both condition there is delay in emptying of stomach hence food don't digest properly so there is very forcible vomiting
( violent vomiting) i.e. every things come out whatever ate before.
The best treatment is reduce secretion of gastric juice from stomach by using H2 blockers and proton pump
inhibitors. These medicines should be taken at the advice of some doctor.
If still no relief than only option is surgery and consult a surgeon who at the advice of some physician will operate the patient.
A medical board constituted and a team of doctor will decide the future of action.
Have a good luck for your child.