It is most likely that she will search only briefly for a toy that has been covered with a blanket because she has not yet acquired an object permanence.
This refers to the human;s ability to understand that all objects still exist even if they are no longer visible.
A very good example is when we place a toy under a blanket, the child who has achieved object permanence knows it is there and can actively seek it.
However, since she is Three-month-old, It is most likely that she will search only briefly for a toy that has been covered with a blanket because she has not yet acquired an object permanence.
Read more about object permanence
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