Think about lead exposure. Sure, it is minimal, and for the average shooter the fully developed system takes care of it for us, but for a fetus the lead particulate is filtering through Mom right to the baby. Junior’s system may not be developed enough to process the lead. Lead exposure has been proven to be responsible for multiple developmental and cognitive issues.
Even an outdoor range exposes you to lead, debris and noise. Plus, there are multiple chemicals involved with cleaning your gun after shooting that you may not want to expose your unborn to.
Bottom line, it is between you and your Doctor. However, unless you life is on the line, consider keeping up your skills by dry firing and save the live fire for when you need a break from the new baby. Cute as they can be, there will come a time when you want to pull your hair out. That is a great time to head to the range and make holes in paper. Just leave your precious bundle at home with Dad.