Here is a link to Federal Regulations regarding pregnant women and neonates: Title 45 PART 46 Subpart B—Additional Protections for Pregnant Women, Human Fetuses and Neonates Involved in Research.
potential risks to pregnant women and fetuses were assessed in prior studies
the risk to the fetus is not greater than minimal and the biomedical knowledge which cannot be obtained by any other means;
If the research holds out the prospect of direct benefit solely to the fetus then the consent of the pregnant woman and the father is obtained
Each individual providing consent ... is fully informed
No inducements, monetary or otherwise, will be offered to terminate a pregnancy
Individuals engaged in the research will have no part in determining the viability of a neonate (46.204)
clinical studies have been conducted and provide data for assessing potential risks to neonates
Each individual providing consent is fully informed regarding the reasonably foreseeable impact of the research on the neonate.
Individuals engaged in the research will have no part in determining the viability of a neonate.
The research holds out the prospect of enhancing the probability of survival of the neonate
biomedical knowledge cannot be obtained by other means
The legally effective informed consent of either parent of the neonate ... is obtained
Vital functions of the neonate will not be artificially maintained;
The research will not terminate the heartbeat or respiration of the neonate (46.205)