The world and all the objects of daily life in our home awaken the interest of most babies. For the first months, a soft cloth can be interesting enough for them to learn to grasp and switch hands and such, then, a simple wooden spoon with wide handle, then things they can chew on such as a damp cloth or a wood ring, later, a wooden salad bowl they can put things in, and so on. Babies are often more interested in real objects because they see us using them. For the first year, one can save oneself the clutter and give them objects from the kitchen provided they're safe, and try to avoid plastic.
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Mother and child by Picasso