In September, when my nanny was out with two children, our four-month-old Mockingbird Single-to-Double Stroller snapped completely in half. This resulted in sending the front seat into the cement and the back seat backwards. We are incredibly thankful that the children were not injured during the incident (both children had just been removed from the stroller, which honestly makes this more concerning that with no weight in the stroller it still snapped in half). This was our second Mockingbird stroller after our first also had a defect.
Stroller had been limited to use on city streets (no off-roading). Children are both under 30lbs (26 and 22lbs). Lighter child was always in the front seat.