(they nearly always exclude pregnant individuals and nursing mothers - and often exclude women because of the possibility they will become pregnant).
Limited data are available about the safety of COVID-19 vaccines for people who are pregnant
Based on how these vaccines work in the body, experts believe they are unlikely to pose a risk for people who are pregnant. However, there are currently limited data on the safety of COVID-19 vaccines in pregnant people.
Clinical trials that study the safety of COVID-19 vaccines and how well they work in pregnant people are underway or planned. Vaccine manufacturers are also collecting and reviewing data from people in the completed clinical trials who received vaccine and became pregnant.
Studies in animals receiving a Moderna, Pfizer-BioNTech, or J&J/Janssen COVID-19 vaccine before or during pregnancy found no safety concerns in pregnant animals or their babies.
https://www.cdc.gov/coronavirus/2019-ncov/vaccines/recommendations/pregnancy.html
Viral shedding is nonsense (i.e. impossible), since none of the currently available vaccines inject the virus (dead or alive-attenuated).
It would be very likely that mom could pass antibodies on to baby - that's how our species is designed so that wee ones can survive until they are capable of producing their own antibodies
We know next to nothing (beyond theory) about long-term consequences of mRNA vaccines - because they have only been in use for a year. Adenovirus vector vaccines (J&J and AstraZeneca) have a bit longer history, but not much. We're not going to know, with absolute certainty, for a few decades.
In the mean time - we know the harm that COVID 19 does. Taking the vaccine is just one of those decisions that has to be known without complete information.
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