Infants through about six months have very little mobility, and therefore will need toys that will stimulate them without frustrating them because of their inability to interact. Soft toys in bright colors that they can put in their mouth are an excellent choice, and if they should happen to make noise all the better. As infants will taste everything in their attempts to identify it, items with sharp corners, loose attachments (such as beads or eyes), or excessive amounts of hair (think stuffed dog) are better suited for older children. Providing colorful pictures for the child to look at while lying down or being changed will delight them, as will a colorful, patterned blanket for tummy time. Many bouncy seats provide a toy bar for the infant to stare at while seated, and allow for interaction as the child grows and learns to use their hands to reach for things. Read more at free articles
From six months to a year children learn to use their hands to explore objects. Soft toys, books, and teething rings are a good choice. This is also a good age to bring out plastic keys, telephones, bathtub squirting toys (be sure they are dry, clean and free of mildew on the inside), rattles, and any other item the child can hold in their hand easily, so long as they do not possess small parts which may present a choking hazard. Soft balls the child can throw will please them, as they are still learning how to use their hands and are delighted by the cause and effect of seeing a ball fly after they throw it.