“Al-ḥāmil” means the pregnant woman; “al-murḍiʿ” is the nursing woman. “Khāfatā” is a dual feminine verb: the two women fear harm. “Walaydayhimā” refers to their children.
The same dual feminine ending appears in “afṭaratā wa-qaḍatā”—both may omit the fast and both perform later make-up. Grammatical agreement keeps the legal subjects clear.