1. The rattle can make sounds, rotate, grab, and shake. It can attract the baby's attention and promote the baby's upper limb muscle development and hand-eye coordination.

2. The bright colors of rattles help babies perceive colors in early stages and promote faster brain development.

3. The sound produced by the rattle can help babies distinguish sounds and identify directions.

4. The geometric three-dimensional figure of the rattle can induce the baby's imagination of space and cultivate creative thinking ability.

5. The rattle that can be chewed can also be used as a teether, which can promote the development of baby's teeth.

6. Let the baby take a look, touch, scratch, and shake. The rattle is an excellent toy for training the baby's initial vision, hearing, and touch.

7. Hearing, vision, and touch are important means for infants and young children to understand and perceive the world. Because between 3 and 10 days after birth, babies can learn to coordinate their eye muscles, focus on a bell 2 feet away, and detect moving lights. Around 20 days old, babies can initially distinguish colors and distinguish the pitch, sound and duration of sounds. One-month-old babies can differentiate between happy and sad music. Therefore, parents can place larger toys 30 cm in front of the newborn baby's eyes. Toys with simple shapes, bright colors or sounds can best attract babies' attention. Some crib bells, baby rattles, and baby handbells are the most suitable first choices.