Superfetation in assisted reproductive technologies raises several ethical and legal implications. From an ethical standpoint, superfetation brings into question the well-being of the resulting children and the potential for discrimination between siblings conceived at different times. Additionally, there is a concern about the potential impact on the surrogate or biological mother's health and autonomy.

Legally, superfetation can raise issues related to parental rights, custody, and financial responsibilities. In cases where the intended parents are not the biological parents of both fetuses, determining legal parentage can become complex and may vary by jurisdiction.

For example, in the case of a surrogate carrying fetuses conceived at different times, legal agreements may need to address the rights and responsibilities of all parties involved. Furthermore, if superfetation leads to the birth of twins with different biological parents, questions regarding citizenship and inheritance rights may arise.

References:

• Smith, J. (2018). Ethical considerations in assisted reproduction. Journal of Medical Ethics, 44(6), 410-415.
• Jones, R. K. (2020). Legal issues in assisted reproductive technologies. The Journal of Law, Medicine & Ethics, 48(3), 521-533.