Under UK law, a child's legal mother is the woman (or person, if trans) who carries and gives birth. Even if the mother is not the biological mother, she (or he) will have the same status as any other mother including:
the right to be recorded as the mother on her (or his) child's birth certificate
parental responsibility - the legal right to make and be involved in decisions about her (or his) child's care, including giving medical consent, and making decisions about education, religion etc
financial responsibility - the duty to provide for her (or his) child, including paying child maintenance if not living with the child
status rights - having a mother-child connection for the purposes of things like British nationality and inheritance and pension rights.
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