This is something I have been thinking about too. We are thinking about trying for baby no 2. I am a nurse, working in high risk area and regularly come into contact with CMV, which causes birth defects. So I obviously always ensure good hand hygiene etc. Our vet is pregnant and is out lambing at mo, I asked her about it. She said she felt that as long as she wears mask/gloves/excellent hand hygiene, then she had reduced her risk enough. But I am very unsure. We will be planning to lamb outside in May 2018, so hoping that will limit the risk a bit more. Eek.