Wait until your baby is one and sits upright with steady head control. A firm...

https://alpha-wiki.win/index.php/What_Age_Can_a_Baby_Ride_on_a_Balance_Bike_Instead_of_a_Seat%3F

Wait until your baby is one and sits upright with steady head control. A firm helmet fit is essential. Use front seats for interaction, rear mounts for balance, or trailers for sleepy riders. Start on quiet paths to build your shared confidence.