The Baby Einstein 4-in-1 Kicking Tunes Learn to Sit Music & Language Floor Seat engages and supports baby 4 ways as they grow to sit independently. Made especially to assist baby's development between bouncer and booster seats, your little learner will love to explore 4 modes of support and discovery. Modes: sit and play, kick and play, snack time, and takealong piano. Once baby can hold their head upright (around 4 months), use the lower position to let them sit safely and comfortably. As baby grows, use the upright position to give baby comfortable support as they learn to sit independently. Baby will love to tap or kick the musical, light-up piano to explore music, learn colors and shapes in 4 languages. Piano can also be placed on the tray to engage baby with over 50 melodies, phrases, and sounds. Seat for ages 4-12 months. Machine washable seat pad. Detachable toy can use used up to 30 months of age. Assembled dimensions: 17.32 x 22.05 x 12.99 inches. Piano requires 3 AA batteries.