At what age is a typical filipino infant able to understand that objects continue to exist even when they are not visible, a milestone known as object permanence ?

Baby Andres, at 8 months old, is playing peek-a-boo with his grandmother. When his grandmother hides her face, Andres looks for her, knowing that she is still there even though he cannot see her. His mother smiles, recognizing that Andres is achieving an important developmental milestone.