On this page:
- Immunization before pregnancy
- Immunization during pregnancy
- Safety of vaccines during pregnancy
- Immunization after pregnancy
It’s best to make sure all of your routine immunizations are up to date before becoming pregnant. This is important because some vaccines cannot be given during pregnancy but provide important protection. For example, the measles, mumps, rubella (MMR) vaccine should not be given during pregnancy (and should be given at least 4 weeks before becoming pregnant), but rubella infection during pregnancy can cause miscarriage and serious birth defects.
Pregnant people should get the pertussis (whooping cough) vaccine and the influenza (flu) vaccine during each pregnancy.
Influenza (flu) vaccine
- Changes in the immune system, heart, and lungs during pregnancy make a person more prone to severe illness and hospitalization from influenza.
- Influenza can be harmful to a pregnant person’s developing baby. It can lead to serious pregnancy complications, including the risk of premature labour and delivery.
- Evidence shows that infants born during the influenza season to people immunized during pregnancy are less likely to be premature, small for gestational age, or of low birth weight.
- When a pregnant person gets the influenza vaccine, they pass protective antibodies along to their baby that can help protect the baby from influenza for several months after birth. This is important because babies can get really sick from influenza but can’t get the vaccine until they are six months old.
- Pertussis can be life-threatening for a newborn, and the younger a baby is when they get pertussis, the more likely they will need to be treated in a hospital. However, babies are not offered the pertussis vaccine until they are two months old.
- The best way to protect your baby from pertussis and its complications during the first months of life is to get the vaccine during your pregnancy. When you get the pertussis vaccine, your body creates protective antibodies, and you pass some of them to your baby before birth. These antibodies will provide your baby with some short-term, early protection against pertussis.
- The hepatitis B vaccine may be recommended for a pregnant person whose job, lifestyle, or health history puts them at high risk of hepatitis B infection.
- The hepatitis A, meningococcal, and polio vaccines may be recommended for pregnant people travelling to countries where these diseases are common. Tell your health care provider if you are travelling outside Canada during your pregnancy.
- The inactivated influenza vaccine has been given to millions of pregnant people over many years. There is good evidence to show it is safe for pregnant people and their babies.
- Many studies have been done on the tetanus, diphtheria, and pertussis (Tdap) vaccine, showing that it is safe for pregnant people and their babies.