Like others have stated, there is a tilt once the baby is in the bassinet given it's C shape design. It is perfectly level without any weight but even a 6lb 11oz baby was enough to cause a roll. Seems to have a negative impact to his sleep, as he ends up pressed against the mesh. Something to consider when buying. On the plus side, it fits neatly just above our bed at the highest setting (Purple mattress and foundation) which is convenient. Haven't used the flex arm as much as we thought we would.