I say, and with God's success: It is not obligatory for the father to give Zakat al-Fitr for the fetus in his mother's womb; due to the lack of complete guardianship; because he does not know if he will live. See: Rad al-Muhtar 2: 75, Bada'i al-Sana'i 2: 70-71, Al-Wiqayah p. 230, and God knows best.