Musannaf Ibn Abi Shayba 13:1541

Abu Bakr narrated to us, he said: Abu Dawud al-Tayalisi narrated to us, from Sa’id ibn ‘Abd al-Rahman, from al-Hasan and Muhammad. Muhammad said: A gift by a woman is not permissible until a year passes or she gives birth to a child. And al-Hasan said: Until she gives birth to a child or she reaches that [age/state].