Sayyiduna Hudhayfah (may Allah be pleased with him) said that the Prophet (peace and blessings be upon him) permitted the acceptance of the testimony of the midwife.
Muhammad bin Abd al-Malik did not hear it from al-A'mash; between them is an unknown man.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الشهادات / 20542