You may think that endless game of dropsy your baby's so keen on - where she drops a toy over the edge of the stroller or high-chair and then watches you pick it up for her -is deeply irritating. But it is through such games that she is beginning to understand cause (dropping a toy) and effect (the toy hits the floor). By understanding cause and effect, your baby can begin to also understand there are predictable responses to her actions -if she smiles at you, you will smile back. From those predictable responses, she can then learn the behaviour that makes things happen, and to get what she wants. Too clever!
As your baby grows, his memory will improve, allowing him to develop the ability to recall a previous experience for a short period of time after the event. With recall memory, he will become much more determined about what he wants. Not only will he be able to remember his toys and how they specifically work, but he'll also be able to imitate actions he has seen earlier. At this age, your baby can anticipate activities - bed time, bath time, lunch and more - and be able to anticipate the future by relying on remembering what's gone before.
This week your baby will get great enjoyment from toys that have buttons to press, noises to activate and doors to open and shut (jack-in-a-box style toys are very popular). These types of toys will encourage repetitive play - it's amazing how often your baby can be surprised by the jack jumping up out of the box! - along with further developing her fine motor skills. She may not yet be ready for a button that needs turning on or off, but switches will be a great hit. And if you choose toys that make noise, try to select those that have a volume switch - it will save your sanity!