For infants, the self can not push and lighter than max. 12 kg. are !! Otherwise there is risk of fracture !!

Ansich the push rod is a great thing. our little weighs currently 10kg because you can anlupfen the Bobbycar with the push rod without any problem and push it all the class through the area. By itself it can not push (16 months).
My niece (same age) currently weighs already 14 kg. Here, the push rod in the plastic area after 4 times anlupfen of Bobbycar's is broken.
The push rod is therefore not suitable for some children more important because the plastic structure at the bottom yields (at the attachment of Bobbycars) and fast breaks.
Conclusion: Only for parents whose children are easier to push a huge relief! For heavier children is the fun short-lived !!