@dlmoodyfan I have thought about it a lot with my dog. He can handle infants, because they don't really move, but once they start crawling, he is not cool with anyone until they're about 28. He has tolerated some friends' very well behaved, quiet children. But he was on leash the whole time. It feels awful not giving him trust to be a good boy, but I also feel bad that he feels unsafe at any time when I am there to protect him.
In my experience with friends who have kids and either my dog was around them, or they had a reactive dog, it is possible to make it work. Lots of education of the children on proper behavior around dogs, slow introduction to the baby, letting your dog smell all the baby's things, and be a part of your pregnancy so he feels like the baby is his to look after as well, and tons of baby gates, with only supervised time together.
My dog surprised me last summer and was obsessed with being around my ex's infant nephew. Anytime we went to their house, my boy was smelling the baby and wanted to be right there. He even showed concern when the baby cried. I was pregnant at the time, and he could definitely tell. It felt like he was trying to show me that he is really a good boy, and was going to be a good big brother. Unfortunately, my pregnancy was not viable, so I don't have more experience to share on that front. But I do feel like there are ways to keep everyone safe and happy. My boy loves baby bok choy as a high value treat that is low in calories. I often have pieces of that to give to him when I want him to learn certain people are safe. I have also introduced him to baby animals I fostered briefly by using a muzzle and having him smell them closely, putting them back in their cages, and removing the muzzle and giving him a reward.
I understand your concern, and you are not alone. We adopt these babies to provide them with a safe and loving home, and adding on to the family can feel like we aren't respecting their needs. It is not an easy decision. The best thing I can say after all of the verbiage is that you are not alone.