It depends. If you use Kesimpta during pregnancy, the drug may affect both your immune system and that of the fetus. Once your child is born, their doctor will order blood tests to check how strong your child’s immune system is.Your child should not receive any live vaccines until their immune system is healthy enough. Live vaccines contain live but weakened pieces of the virus or bacterium they’re meant to defend against. When an immune system is strong, live vaccines usually won’t cause infection. But live vaccines may cause infection if an immune system is weak.Once your child is born, they should be able to receive non-live vaccines on schedule. Non-live vaccines don’t contain live viruses or bacteria. So they aren’t likely to cause symptoms of the illness the vaccine is meant to prevent.However, your child’s doctor may order blood tests to see if the non-live vaccine is working. This is because non-live vaccines require the immune system to be healthy in order to act properly. If your child has a weakened immune system, non-live vaccines may not work as well as usual.For information on which vaccines are live and which are non-live, see “Live vaccines” and “Non-live vaccines” in the “Kesimpta interactions” section. If you have any questions about your child’s vaccine schedule, be sure to talk with their doctor.