Is the disagreement among scholars, such as Ibn Hajar and Al-Qurtubi, in determining the sex of the newborn and its resemblance, due to ijtihad (independent reasoning)? And how can their statements, which contradict science, be reconciled?

The hadiths that mention the creation of the fetus explain the reason for resemblance. If the man's fluid overrides the woman's fluid, the child will resemble his paternal uncles, and if the woman's fluid overrides the man's fluid, he will resemble his maternal uncles. The reason for determining the gender of the fetus is mentioned in the hadith of Thawban: "If the white fluid of the man and the yellow fluid of the woman combine, and the man's fluid overrides the woman's fluid, it will be a male by Allah's permission. And if the woman's fluid overrides the man's fluid, it will be a female by Allah's permission." It has been perplexing to some that the 'overriding' of fluid is mentioned in Aisha's hadith as a reason for resemblance, and in Thawban's hadith as a reason for gender determination. Also, Thawban's hadith implies that the woman's fluid plays a role in determining the fetus's gender. Al-Qurtubi was of the opinion that 'overriding' in Thawban's hadith means the fluid reaching the womb first, while Ibn al-Qayyim believes that the precedence of one of the two fluids is a reason for resemblance, and the overriding of one of them is a reason for the child to resemble the one whose fluid overrides. The answer to the second perplexity is that Thawban's hadith does not indicate that the woman's fluid is a primary cause, but rather that it has an influence. Sheikh al-Islam Ibn Taymiyyah believed that the wording of Thawban's hadith had some reservations, and that the first wording was preserved, and that male or female offspring is not due to a natural cause, but rather by the command of the Lord.