“Forcing someone to be on birth control against their will is a violation of basic human rights and bodily autonomy, just as forcing someone to become or stay pregnant against their will would be,” said Ruth Dawson, a principal policy associate at the Guttmacher Institute, a research group that supports reproductive rights. Court-condoned compelled contraception is rare in conservatorship. But the specter it raises — forced sterilization — does have a grim, extensive history in the United States, especially against poor women, women of color and inmates. In the early 20th century, the state-sanctioned practice was upheld by the United States Supreme Court... Typically, a conservator has temporary control over the finances and even medical care of an incapacitated person. Experts underscored that Ms. Spears’s assertion is unverified. But if it’s accurate, they said, the most likely rationale, however suspect, might be that Jamie Spears, her father, wants to protect her finances from a baby’s father, potentially her boyfriend, who is reportedly at odds with Mr. Spears. If a guardian fears that a ward will make financially unwise choices, “the remedy is not to say they can’t procreate,” said Sylvia Law, a health law scholar at New York University School of Law. “It’s unspeakable.”