Thank you for your query.
Let me allay your fear regarding pyloric stenosis
in a 2 year child. Congenital pyrloric stenois is seen in the first few weeks of life and certainly not at this age. The acid reflux
will not cause stenosis so soon.
occuring on alternate days as mentioned by you could be either due to some food taken by the child which is not being tolerated or some infection. I would suggest a wait and watch attitude if there are no more than 1-2 vomits in a day.
Wishing your daughter all the best......