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Inclusion Criteria:

* Pregnant and an estimated gestational age (GA; based on ultrasound dating) from Week 13 to 18 at randomization
* Has a history of greater than or equal to (\>=) 1 prior pregnancy with fetal and neonatal alloimmune thrombocytopenia (FNAIT) (including neonatal platelet count less than (\<) 150×10\^9/Liter) with none of them affected by fetal/neonatal intracranial hemorrhage (ICH) or severe hemorrhage based on a clinical review of the medical records
* Current pregnancy with presence of maternal anti- human platelet antigen (HPA)-1a alloantibody and positive fetal HPA-1a genotype as confirmed by cell-free fetal deoxyribonucleic acid (DNA) in maternal blood
* Health status considered stable by the investigator based on physical examination, medical history, vital signs, 12-lead Electrocardiogram (ECG), and clinical laboratory tests performed at screening
* For maternal participant and neonate/infant, willing to forego participation in another clinical study of an investigational therapy until the last follow-up visit

Exclusion Criteria:

* Currently pregnant with multiple gestations (twins or more)
* History of severe preeclampsia in a previous pregnancy
* History of myocardial infarction, unstable ischemic heart disease, or stroke
* Known allergies, hypersensitivity, or intolerance to nipocalimab or its excipients (refer to the Investigator Brochure (IB))
* Has any confirmed or suspected clinical immunodeficiency syndrome or has a family history of congenital or hereditary immunodeficiency unless confirmed absent in the participant

• Leuven, Belgium
• Recife, Brazil
• Rio de Janeiro, Brazil
• São Paulo, Brazil
• Lille, France
• Paris, France
• Budapest, Hungary
• Ramat Gan, Israel
• Milan, Italy
• Rome, Italy
• Bergen, Norway
• Oslo, Norway
• Tromsø, Norway
• Trondheim, Norway
• Košice, Slovakia
• Martin, Slovakia
• Nové Zámky, Slovakia
• Ljubljana, Slovenia
• Seville, Spain
• Stockholm, Sweden
• Lausanne, Switzerland