There are many infant learning toys that can be used for sensory stimulation that will definitely help to increase their physical, cognitive, and emotional capabilities; all of which are connected to infant brain development.
As a parent myself, I have found that some of these toys seem to be more effective than others for infant learning and development.
0-3 Month Infant Learning Toy Suggestions
Rattles (foot and wrist): These are great toys for stimulating the sense of touch. This also helps them do develop a sense of directional hearing. It will also encourage movement of arms and legs in order to make the sounds.
Black and White Toys/Books: Black and white are boldest of color contrasts and are some of the only colors newborn's can see. These toys will help to develop their visual focus. There are a variety of books that offer black and white (and sometimes red) colors and if you are choosing a stuffed animal to develop recognition of faces, then you may want to choose pandas, zebras or penguins for good contrasts.
Mobiles: These strengthen eye muscles and eye control, and help develop listening skills through music. They can also be soothing to those "fussy" babies.
Soft Balls and Stuffed Toys/Animals: Balls and stuffed toys with many textures offer your infant a tactile experience that helps develop their grasp and hand and arm movements. While they cannot hold it on their own, they may open their hand when it brushes them, and they can be used for eye muscle development as well.
Wind Chimes: These are great for tone development and for auditory development. They too, can be soothing sounds to calm them when needed.
Soft Books with Textures: It is never to early to start reading to you baby and by showing them the pictures and colors, you are stimulating cognitive development as well as visual acuity and color contrast.
3-6 Month Infant Learning Toy Suggestions
Rattles (ones they can hold): This helps develop fine motor skills in the future and helps them to develop the muscles in their hands and fingers. They can also learn action/reaction by shaking them. It also helps listening skills.
Playmat/Play Gym: This is a great necessity if you want to get your infant rolling over and starting to reach for toys. Some have dangling toys above and some have toys that make squeaking sounds when they grasp them. They are great for developing arm and leg muscles and control, eye muscles, hand-eye coordination, and gross motor skills. They are also great for "tummy time", which is a popular tactic to get your baby to strengthen their back, shoulders, and neck muscles in order to push up and keep their heads up. (The first stages of getting into the crawling position). They also have bright, stimulating colors and textures.
Baby Mirrors: These are great toys for encouraging face recognition, smiling, for developing visual focus. Babies love human faces as a focal point, so these keep them entertained for quite awhile!
Teethers: These are perfect for developing the muscles in the mouth, and for controlling drooling and helping soothe teething symptoms. It also helps with their ability to grasp and control their hands. Hand to mouth coordination also benefits from teether use.
Soft Balls: These are great for developing different textural sensations and for learning to grasp. They may be even used to encourage rolling over and even crawling and reaching.
Action/Reaction Toys: These are great for developing cognitive skills. Squeaking toys, toys that make sound when kicking it or batting at it, and toys encouraging crawling like action toys that move slowly for an infant to catch, are all great!
Plastic Keys on a Ring (and other small toys they can easily manipulate): Great for developing hand and arm muscles and control. The sound of the shaking can also be considered an action/reaction toy.
Hanging Toys: These are found on playmats and as activity bars for infant car seats, and strollers. Mobiles can be included in this category , for they all help build the large muscle groups and help to develop hand-eye coordination and visual acuity.
Board Books and Soft Books: Reading with your baby develops memory skills, color contrast, recognition of pictures and faces, and it develops communication as well.
Through these infant learning toys, you will find a dramatic increase in your baby's sensory areas and brain development. You options are endless, so play with your baby and see how much they grow!