Advice on preparing dogs for new family member?

Marit
Anyone out there with experience introducing a baby to the family dog, advice would be great! We have a 2 yo German Shepherd bitch and are expecting our first. She has unfortunately not had the chance to regularly spend time with kids and she is a bit insecure so she tends to bark to scare unfamiliar things off. Obviously realise we will never trust her alone with kids, but I'm sure someone on here must have some insights that could help ease the transition. Thanks!