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'born at Boston ... Mercy, b. 19 Mar. 1669/70.'
'1669 ... Mary of John & Martha Mellowes born Mar. 19.'
Her name is in this transcription is given as Mary - the error might be in the transcription or in the original source.
'Martha, Elizabeth, Oliver, Sara, and Mercy, children of Jno. and Martha Mellows, were bapt. at Boston, 8 May 1670.'