A one year old is fascinated by cause and effect, and noise toys demonstrate cause and effect dramatically. Xylophone mallets that create actual musical sounds rather than random pings develop rhythm recognition. Drums with soft heads and sticks teach percussion without destroying your eardrums. Shakers filled with beads or bells offer immediate audio feedback for every movement. Musical instruments designed for small hands let them make intentional sounds rather than random banging. Noise-making toys with buttons or levers mean they discover what happens when they press things. These toys are genuinely educational because the baby is learning that they can make things happen, which is the foundational understanding that everything else builds on.