The decline in fertility experienced a noteworthy acceleration in the early 20th century. In 1900, the fertility rate stood at 4.8, which plummeted to 2.3 by 1933. In the late 1930s, fertility rates experienced an uptick, but it later plummeted due to the war, particularly in 1940 as a result of the Winter War. Although the ceasefire caused a spike in births, the resumption of hostilities stalled family planning efforts. Post-war in autumn 1944, there was a resurgence in births, leading to a total fertility rate of 3.1 in 1945, reaching a peak of 3.5 in 1947–1948, a record that remains unbroken. However, fertility rates began a steady decline, dipping below the generational renewal threshold of 2.1 by 1969. Finnish fertility rates have not recovered to this level since.
The decline in fertility experienced a noteworthy acceleration in the early 20th century. In 1900, the fertility rate stood at 4.8, which plummeted to 2.3 by 1933. In the late 1930s, fertility rates experienced an uptick, but it later plummeted due to the war, particularly in 1940 as a result of the Winter War Although the ceasefire caused a spike in births, the resumption of hostilities stalled family planning efforts. Post-war in autumn 1944, there was a resurgence in births, leading to a total fertility rate of 3.1 in 1945, reaching a peak of 3.5 in 1947–1948, a record that remains unbroken. However, fertility rates began a steady decline, dipping below the generational renewal threshold of 21 by 1969. Finnish fertility rates have not recovered to this level since.