A: It's pretty much assembled out of the box. You have to put on the wheels.
A: You would need to assemble some parts of the stroller. Please visit babytrend website for more details.
A: The bumper bar is removable. However, you will not be able to extend the bar for taller individuals.
A: The recommended usage is based on weight and height: Sit upright unassisted ~ 45 lbs or 40"
A: Please contact Baby Trend Customer Service Department and a representative will be able to assist you with your question.