It is permissible to have intercourse with a breastfeeding woman (Ghilah), and 'Azl is disliked Sahih Muslim 1442 c

Sahih Muslim 1442c
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Translation
Judama bint Wahb al-Asadiyya (Allah be pleased with her) reported

I heard Allah's Messenger (ﷺ) saying this. The rest of the hadith is the same concerning 'azl and ghila (cohabitating with a suckling woman), but with a slight variation of words.