Why did teodora alonso make a vow to go on pilgrimage to antipolo when she gave birth to rizal?

Teodora Alonso made a vow to go on a pilgrimage to Antipolo as a sign of gratitude for a safe childbirth with her son, Jose Rizal. It was a common practice in Filipino culture during that time to make such vows to religious images or figures in exchange for favors or blessings granted.