Toddlers should be correctly breathing unless they are sick or ill. While most newborns begin breathing correctly, very few still maintain natural breathing through their early childhood. Most toddlers lose their much-needed muscle coordination very early in their lives. With the loss of our natural breathing and development of chronic breathing inefficiency, we also change our relationship with stress and our response to it. Our response to stress is exaggerated because we are unable to relax our rigid muscles, which leads to them being tired and weakened. Such a person, due to their weak structure, experiences outside pressures way more severely. This eventually leads to psychophysical problems. They develop chronic muscular tension and become oversensitive to CO2 in their blood.