It is recommended to pay Zakat al-Fitr on behalf of every member of the family, including unborn children after the 120th day of pregnancy, according to some scholars. However, it is not viewed as obligatory. Most scholars agree that Zakat al-Fitr should be paid on behalf of the baby after his or her birth. We advise you to seek further clarification from your local imam or scholar to ensure you are making the appropriate decision.