Following the merger, Hanoi is the only locality in the northern region with the lowest birth rate in history.

In the 34 provinces and cities after the merger, 10 localities recorded a fertility rate of over 2.3 children per woman, while the other 8 localities had a fertility rate of less than 1.8 children per woman.

Dien Bien leads in birth rate.

Following the merger, Dien Bien became the province with the highest fertility rate in the country, at 2.6 children per woman. Ranked second and third were Tuyen Quang (formed from the merger of the former Ha Giang and Tuyen Quang provinces) with 2.55 children per woman and Lao Cai (formed from the merger of the former Yen Bai and Lao Cai provinces) with 2.5 children per woman, respectively.

Prior to the merger, these localities already had high fertility rates. According to data released by the General Statistics Office at the end of June 2024, Ha Giang was the "champion" with a total fertility rate of 2.69 children per woman, while Tuyen Quang had 2.19 children per woman. For the Lao Cai - Yen Bai pair, the average fertility rates were 2.55 and 2.47 children per woman, respectively.

According to the Population Department, after the merger, 21 out of 34 provinces and cities achieved a fertility rate of over 2.1 children per woman, with 17 provinces having a rate above 2.2 children and 10 provinces exceeding 2.3 children.

These localities are mainly concentrated from Quang Tri northward, especially in the northern mountainous areas such as Thai Nguyen, Lang Son, Phu Tho, Dien Bien, Lai Chau, Son La, Thanh Hoa, Ha Tinh, and Quang Tri.

Ho Chi Minh City and Hanoi have the lowest birth rates.

Regarding the low fertility rate group, Ho Chi Minh City, after the merger of Ho Chi Minh City, Binh Duong, and Vung Tau, still holds the position of having the lowest fertility rate in the country with 1.43 children per woman.

Next is Tay Ninh (imported from Long An and the former Tay Ninh) with 1.52 children per woman and Can Tho (imported from Soc Trang, Hau Giang and the former Can Tho) with 1.55 children per woman.

Notably, Hanoi is the only locality in the northern region with a low birth rate of less than 2 children per woman, at 1.86 children. This figure continues to decrease by 0.02 compared to 2023, creating the lowest birth rate in the capital's history.

According to the latest figures from the General Statistics Office, the fertility rate in Vietnam in 2024 is 1.91 children per woman, a decrease of 0.05 compared to 2023. Vietnam's fertility rate is projected to continue declining in the coming years.

To encourage childbirth, many localities issued specific support policies before July 1st. For example, Ho Chi Minh City compiled a list of women who have given birth to two children before the age of 35 and will receive 3 million VND in support.

For special groups, pregnant women and newborns from poor, near-poor, social welfare-supported households or living in island communes will receive support for prenatal and newborn screening totaling 2 million VND. Specifically, 600,000 VND for prenatal screening, 400,000 VND for newborn screening, and 1 million VND in direct support.