A friend from Masbate says her mother used to give her young, unripe, still very small, juvenile pineapple fresh from the garden.
This pineapple is stripped naked and fed to the child first thing in the morning. Then watch the stools if worms are driven out. Do this for 3 days and keep watching the stools for worms. She says her mother looked for live worms.
Must try this. The nearest pineapple farm from Manila is Tagaytay.
A tip from from the mountains of the island of Masbate, Philippines!