As the country liberalizes its two-child policy, more and more post-80s, post-seventies and even post-sixes are ready to have their second child. In fact, in foreign countries, senior pregnancy is not uncommon. Tesla electric car founder Elon Musk’s mom, Maye Musk, was featured on the cover of a 2011 issue of New York Weekly, where the 63-year-old was pregnant with a large belly. The headline read: Is this (pregnancy) too old for her? The cover article is an exploration of fertility in middle-aged women. As an older mother, the risk of pregnancy complications is relatively higher, and one of the most important risks is blood clots. One of the most important risks is blood clots. Blood clots are a topic of concern for everyone and can be disabling or fatal. Therefore, prevention is important, and preventive measures can be taken to eliminate the occurrence of blood clots. 1.Why are older mothers prone to thrombosis? Maternal blood is more prone to clotting, which is a self-protective mechanism of the body. We call this medical phenomenon the hypercoagulable state of pregnancy, which is conducive to effective hemostasis and prevention of possible excessive blood loss during normal delivery or abortion, but also increases the risk of thrombosis and embolism. This hypercoagulable state persists throughout pregnancy until 8 weeks after delivery, resulting in a 4- to 5-fold increase in the incidence of thrombosis during pregnancy compared to other women of childbearing age, and an even 20-fold increase in the risk of thrombosis within 8 weeks after delivery, with the risk of thrombosis increasing exponentially with age. more than 80% of thrombotic sites occur in the lower extremities, that is, in the legs, and in other sites, including the neck, intracranial, subclavian, and pulmonary embolism, etc. The age of 35 is a watershed for women, and the risk for pregnant women and the probability of fetal complications and malformations increases tens of times when the age of 35 is exceeded, which is medically called advanced primigravida. The first hospital of Peking University admitted maternal blood clots, more than thirty years of age accounted for two-thirds, more than thirty-five accounted for about one-half. 2. So, the question is, what should I do to prevent thrombosis when I am pregnant with my second child at an older age? In order to prevent thrombosis during pregnancy and delivery, we should prevent it from the following aspects ①Obstetrical examination to evaluate the risk factors of thrombosis. Women with a history of recurrent miscarriages should consider autoimmune diseases such as antiphospholipid antibody syndrome, and women who take oral contraceptives for a long time are also at high risk for thrombosis. Pregnant patients with a previous history of thrombosis or a high risk of thrombosis should be given prophylactic doses of low molecular heparin. The media reported that the movie star Winnie Tsui had to take 300 injections during her pregnancy because she needed subcutaneous injection of low-molecular heparin for her high risk of thrombosis and eventually delivered successfully. Timely measures such as anticoagulation with low molecular heparin can effectively prevent blood clots and ensure the safety of mother and child. ②Position and exercise: During pregnancy, the uterus gradually increases, and the enlarged uterus will compress the inferior vena cava and iliac vein, which lasts for about 4-5 months until delivery. The continuous compression of the uterus on the inferior vena cava and iliac vein makes the venous blood return to the lower extremities poor, resulting in increased resistance to venous return, blood stagnation and slowed flow, which greatly increases the risk of thrombosis. Pregnant women resting on their back is not good for venous return. Pregnant women resting in bed should take the side position, avoiding the supine position that is lying face up. At the same time, maintain appropriate exercise, such as walking, appropriate straight leg raising exercises, etc., to promote venous return of the lower limbs. Often do lower limb flexion and extension activities, lying in bed when you can lift the legs alternately flexion and extension, do cycling action. Such exercise can mobilize the role of calf muscle pump, move the knee joint and ankle joint, reduce the pressure of lower limb veins, accelerate the flow rate of lower limb venous blood, which is conducive to the return of venous blood. ③ Diet: It is advisable to have a light, high-calorie, high dietary fiber, low-salt, low-fat diet, and drink more water to keep the bowels open. ④Dress: wear loose underwear. Pregnant women with varicose veins or previous history of thrombosis should wear medical secondary compression elastic stockings, which have pressure gradient to reduce venous hypertension, reduce edema and improve tissue microcirculation. They should be worn until normal activity after delivery, not only to prevent deep vein thrombosis in the lower extremities, but also to maintain body shape. Elastic medical stockings with a secondary pressure gradient can reduce venous hypertension, reduce edema and improve tissue microcirculation. Several clinical trials have demonstrated the effectiveness of long-term use of medical compression stockings in preventing thrombosis and post-thrombotic syndrome. The American College of Chest Physicians (ACCP) guidelines recommend wearing secondary compression stockings for at least 2 years for patients with acute symptomatic proximal deep vein thrombosis. 3.Postpartum preventive measures For normal delivery: elevate the lower limbs and encourage early bed activity; for cesarean delivery: in addition to medication for pain relief, perform voluntary activities in bed 6 hours after surgery; actively prevent thrombosis through early activity, appropriate position, and enhanced diet, so as to better protect maternal life safety and quality of life. In the early postpartum period, simple ankle flexion and extension movements can be performed in bed: forcefully extend the foot downward, straighten the ankle joint as much as possible, and hold it for 1 to 2 seconds; then forcefully dorsiflex the foot (hook the foot) and hold it for 1 to 2 seconds, which is a simple and effective method to prevent thrombosis.