The most important place among developmental toys is occupied by rattles. It is they are responsible for the development of sound perception, as well as acquaintance of the child with colour.
Especially difficult is the choice of such a toy for very young children, since at an early age they are particularly susceptible to any environmental influences. It is worth noting that rattles from the company "Polesie" are created without the use of glue materials, which makes the toys as safe as possible for the child.
When connecting the parts ultrasonic equipment is used.
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