Partus sequitur ventrem means the offspring follows the mother. And origin is from Latin.
This maxim was a legal doctrine concerning the slave or free status of children born in the English royal colonies. Incorporated into legislation in the British American colonies and later in the United States, partus held that the social status of a child followed that of his or her mother. Thus, any child born to an enslaved woman was born into slavery, regardless of the ancestry or citizenship of the father; this principle was widely adopted into the laws regarding slavery in the colonies and the following United States, eliminating the financial responsibility of fathers for children born into slavery.
- Tucker v. Farm and general investment trust ltd.,  2 Q.B. 421
A greater property goes to a lessee under a lease than goes to a hirer under a hire-purchase agreement. The title is reserved to the defendants, the finance company, the rule Partus sequitur ventrem applies. If it is necessary to imply any term into this contract, the term implied by the county court judge that any progeny born during the hiring should be deemed to become part of “the goods” is the correct term.
2. Westropp v. Elligott. (1884) 9 App. Case 815
In the present case, there is a plain, unambiguous contract to which the principle Partus sequitur ventrem applies. If the contract is plain upon its face, what the parties may have intended is immaterial. No such term as is contended for by the plaintiff can be implied. At the time of entering into the agreement, Perry had no intention of separating the ewes and their offspring after their birth. A term can only be implied to give a contract business efficacy if such be necessary at the time that the contract is made. This contract already had business efficacy, it was clear and plain, and no term should be implied. The description of “Goods” in the contract is quite clear and ownership of the progeny follows that of the mothers.