Judamat al-Asadiyyah said that she heard the Messenger of Allah (May peace be upon him) Say:I intended to prohibit suckling during pregnancy (ghailah), but I considered the Greeks and the Persians and saw that they practiced it, without any injury being caused to their children thereby. Malik said : Ghailah means that a man has intercourse with a women while she is suckling a child

English translation · Sunan Abu Dawud