This Sassy Stacks of Circles Stacking Ring STEM Learning Toy is the perfect toy for babies aged 6+ months who are looking to develop their language, hand-eye coordination, problem-solving, memory, chewing, sequencing, motor skills, and creativity. With its multicolor design and puzzle toy theme, this toy will keep your little one engaged and entertained for hours. The set includes 9 stacking rings that are sized for 6-24 month-olds and are suitable for both boys and girls.