It is generally recommended that you get a tetanus shot during pregnancy or shortly after giving birth, as long as it is in accordance to the routine vaccination schedule. There are some situations in which you should not receive a tetanus shot, such as if you are allergic to any components of the vaccine. There are a few side effects with the vaccine, although it is considered to be safe for your fetus. Getting vaccinated protects both you and your infant from becoming infected with the potentially fatal disease.

A tetanus shot is commonly combined with the vaccine for diphtheria and pertussis, known as a TDaP vaccine. In most developed countries, the vaccine is received as an infant and then administered again every ten years as an adult. It is 95% effective in preventing the disease and allows the body to produce antibodies without having to actually become infected. The tetanus vaccine is composed of toxoids, which are chemically changed proteins from the bacteria that cause the disease, so it is considered to be safe to get a tetanus shot during pregnancy.

If you are unsure of your immunization status or were immunized more than ten years ago, then you should get the tetanus shot during pregnancy. Doctors will usually recommend getting it during the second or third trimester, and it will usually not include the component for pertussis if given during pregnancy. If your last tetanus shot was less than ten years ago, you will typically get a tetanus shot post-partum, and if it was less than two years ago, doctors might wait longer to give you the shot. In addition, if you get a deep cut or wound that puts you at risk for tetanus while you are pregnant, a doctor may decide to administer the tetanus vaccine immediately, depending on your immunization history.

There are some cases in which you should not receive a tetanus shot during pregnancy. It is not recommended to get the shot within two years of your most recent one. Also, if you are allergic to any components in the shot or have had a reaction to it in the past, it is generally accepted that the risks outweigh the benefits of receiving the vaccine. You should ask your doctor before getting a tetanus shot if your parents or siblings have had seizures after receiving a tetanus shot, you have unstable brain problems, or you are moderately to severely ill.

If you get a tetanus shot during pregnancy, you might experience a few side effects. It is possible to have a low-grade fever, soreness and swelling at the injection site, or allergic reactions. There is no evidence of risk to the fetus, however, since it is not a live-virus vaccine.

When you are immunized with a tetanus shot during pregnancy, the antibodies pass through the placenta, so your immunity passes to your infant. This can prevent your child from getting infected with a potentially fatal disease, as tetanus has a high mortality rate in infants. The disease is caused by bacteria that are present in soil and enter the body through a dirty cut or wound, such as an umbilical cord stump. Infants who get tetanus experience muscle spasms and stiffness, convulsions, and have difficulty swallowing. Even with treatment, many infants do not survive the complications from tetanus.