Musannaf Ibn Abi Shaybah

Hazrat Qatadah, Hazrat Saeed bin Musayyib, Hazrat Ata, and Hazrat Sulaiman bin Yasar (may Allah be pleased with them) state that if a man gives his wife one divorce and after that the woman gives birth to one child while another child is still in her womb, then before the birth of the second child, the man can take her back.