failure of mammary gland growth during pregnancy csmith arrest, or failure ti initiate the extensive and rapid branching of the mammary ducts, expansion of mammary epithelium in the stroma between the ducts with or without abnormalities in nipple maturation in preparation for lactation 2013-08-10T18:24:43Z MPheno.ontology MP:0012074 arrested mammary gland growth during pregnancy impaired mammary gland growth during pregnancy