“…Theoretically, the direct factor of fertility is influenced by several indirect factors, including social, demographic, economic and cultural factors. North Sumatra with its Batak ethnicity is known as one of the regions in Indonesia that holds tightly to patrilineal culture (paternal lineage), meaning that the presence of sons is an important thing in the family (Gultom, 2017) Batak tribal communities, in terms of the number and sex of children, greatly affect the fertility rate in North Sumatra (Sitorus, 2020). Figure 3 shows the change in fertility measures in North Sumatra based on the IDHS results in 2002/03 and IDHS in 2017.…”