Why is it recommended to avoid using Baby Balance Bike on slopes, slippery or muddy roads? What safety hazards may there be in these scenarios?

Baby Balance Bike are designed with low center of gravity and four-wheel stability as the main features, but slope terrain will change the contact angle between the vehicle and the ground, causing the center of gravity to shift. When the vehicle body tilts, it is difficult for children to maintain balance through body adjustments, especially on steep or long slopes. The physical structure of the four-wheel support may not be able to offset the effect of gravity, causing rollover. If parents do not intervene in time, the vehicle body may accelerate down the slope, collide with obstacles or fall into dangerous areas such as ditches and steps.
Most Baby Balance Bike rely on the friction of the feet on the ground to decelerate, and there is no physical brake device. On a slope, the effect of gravity will significantly increase the sliding speed. Children cannot effectively control the speed due to insufficient strength or delayed reaction, and may rush out of the safe area due to inertia. For example, cases show that children have rushed from a slope into the road or ditch, causing serious injuries.
Slope sections are often accompanied by changes in road material (such as transition from grass to concrete) or obstacles (such as stones and drainage ditches). The silent wheel material (such as EVA foam) of the baby balance car has low friction on hard slopes. If it encounters gravel or slippery surfaces, it may cause the wheels to slip or suddenly turn out of control.
Wet and slippery roads will significantly reduce the friction between the tire and the ground. The flashing wheels of baby balance cars are usually made of hard plastic or thin rubber, which have poor drainage and grip. Tests show that on wet tiles or wooden floors, the lateral friction of the wheels may be reduced by more than 50%, causing the body to slide or "drift", and children are prone to fall due to loss of balance. In a slippery environment, the effect of foot friction deceleration is greatly reduced. For example, when the braking distance on a dry road is 1 meter, it may be extended to 2-3 meters on a wet road. If a child rides close to furniture or walls indoors, or close to dangerous areas such as vehicles and pools outdoors, the extended braking distance will directly increase the risk of collision. Rainy and snowy weather may be accompanied by blurred vision, and parents and children's ability to judge surrounding obstacles will decrease. At the same time, the luminous effect of the flashing wheel may be weakened in the rain, further reducing the attention of other pedestrians or vehicles to children.
The soft soil on muddy roads can cause wheels to sink, increasing rolling resistance. The narrow wheel design of Baby Balance Bike lacks a mud drainage groove structure, which can easily be wrapped by mud to form a "sticky effect", causing the wheels to get stuck or difficult to turn. At this time, the child may lose balance due to excessive force, or fall forward due to the sudden stagnation of the vehicle body. Hard objects such as sand, gravel, branches, etc. in the mud may splash with the rotation of the wheels and hit the child's face or eyes. Long-term use in muddy environments will also accelerate the wear of the axle and bearings, causing structural loosening (such as screws falling off and wheel hub deformation), burying safety hazards in subsequent riding. Muddy environments often contain microorganisms or chemical pollutants, which may be transmitted to the hands or mouth through children's contact after the wheels are contaminated. The gaps in the wheel hubs of some balance bikes are difficult to clean thoroughly, becoming a breeding ground for germs.
Muddy slopes may cause the wheels to completely lose grip, causing the vehicle body to accelerate down and be unable to brake; the slippery edge of the step may cause the wheels to slip and fall, causing head or spine impact. In such scenarios, even if parents are present, they may not be able to provide timely rescue due to insufficient reaction time.