Most experts suggest waiting until your baby turns one. They need strong neck...

https://highstylife.com/can-i-use-a-child-bike-seat-on-an-e-bike-a-service-writers-guide-to-family-cycling/

Most experts suggest waiting until your baby turns one. They need strong neck control to support a helmet and handle inevitable bumps. Check that your little one sits upright independently without wobbling before you ride