The Palermo Protocol contains no occurrence of the word born, and none of pregnant.
UNODC's Global Report on Trafficking in Persons 2024 contains no occurrence of born. Pregnant appears once, inside a quotation from a survivor. The UN's principal data product on trafficking does not count these children at all.
The Lanzarote Convention contains no occurrence of born, pregnant or offspring. Its subject is the child as a direct victim, and this child arrived afterwards.
Directive 2011/36/EU mentions pregnancy only as a factor in assessing a victim's vulnerability.
Source: Europaparlamentets och rådets direktiv (EU) 2024/1712 av 13 juni 2024 om ändring av direktiv 2011/36/EU, i kraft 14 juli 2024.
Rebecca Surtees, NEXUS Institute, Women & Therapy 40(1–2), 2016.