The b dual is a flexible pushchair that with the addition of a second seat transforms into an in line tandem travel system for two children from birth to toddler the main seat unit can be used rearward or forward facing and has a lay flat position for newborns the b dual can be used for children of different ages or for twins as a seat unit or an infant carrier can be fitted in either the front or rear position features in line tandem travel system rearward and forward facing seat to main