I would also encourage you to look into coached vs instinctive pushing. In a hospital setting, many care providers will ask you to start pushing as soon as you have reached 10cm, regardless of whether you feel the urge to push. In this scenario, both mothers and babies can quickly become tired and stressed and a ventouse is called for. If you opt to wait until you feel the urge to push, your body is doing the work for you. There is often a significant delay between reaching full dilation and feeling the urge to push, which is nature's way of giving us a break.