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'According to the records he was married to his first wife, Sarah, daughter of Rowland and Sarah Stebbins, July 14, 1639. She died after having borne him five children, ...'
The date was the 7th month - Sept according to old-style dates.
'MIRICK, Thomas (1620-1704) & 1/wf Sarah STEBBINS (ca 1623-1649); 14 Sep 1639; Springfield'
Sarah must have died in 1649/50, since her daughter Hannah was born in 1649/50.
ii SARAH STEBBINS, b. about 1623 (aged 11 on 30 April 1634 [Hotten 278])