Is it disliked or forbidden for a woman who is breastfeeding to become pregnant?

There is no blame on a breastfeeding woman for becoming pregnant before completing the period of nursing her child, due to the Prophet's (peace be upon him) saying: "I had intended to forbid ghilah (cohabiting with a breastfeeding woman), but then I looked at the Romans and Persians, and indeed they commit ghilah with their children, and that does not harm their children at all." This hadith (definition) indicates the permissibility of pregnancy during the breastfeeding period.