Pyloric stenosis is a condition generally present at birth but can go unnoticed or uncorrected even upto a few years of age. It generally presents with recurrent vomiting following feeds since the feed cannot pass into the next part called duodenum. However, I would strongly insist that you do not jump to any conclusions and get her examined by a doctor. There can be a number of diseases presenting with the same symptoms. If it is diagnosed to be pyloric stenosis, the treatment is very simple but surgical. The treatment is same as in case of a newborn, i.e. a small nick on the muscle of the pylorus to release the constriction and correct the opening.