Giant panda Tian Bao plays at Pairi Daiza zoo in Brugelette, Belgium, Sept. 25, 2019. Giant panda Hao Hao gave birth to two cubs on Aug. 8, 2019. This was the 2nd and 3rd birth of giant panda at Pairi Daiza after the birth of Tian Bao, a male, on June 2, 2016, a historic first for Belgium. (Photos: Xinhua)

Giant panda Tian Bao eats bamboo branches at Pairi Daiza zoo in Brugelette, Belgium, Sept. 25, 2019. Giant panda Hao Hao gave birth to two cubs on Aug. 8, 2019. This was the 2nd and 3rd birth of giant panda at Pairi Daiza after the birth of Tian Bao, a male, on June 2, 2016, a historic first for Belgium.

Photo taken on Sept. 25, 2019 shows the twin panda cubs at Pairi Daiza zoo in Brugelette, Belgium. Giant panda Hao Hao gave birth to two cubs on Aug. 8, 2019. This was the 2nd and 3rd birth of giant panda at Pairi Daiza after the birth of Tian Bao, a male, on June 2, 2016, a historic first for Belgium.

Giant panda Tian Bao eats bamboo branches at Pairi Daiza zoo in Brugelette, Belgium, Sept. 25, 2019. Giant panda Hao Hao gave birth to two cubs on Aug. 8, 2019. This was the 2nd and 3rd birth of giant panda at Pairi Daiza after the birth of Tian Bao, a male, on June 2, 2016, a historic first for Belgium.

Photo taken on Sept. 25, 2019 shows the twin panda cubs at Pairi Daiza zoo in Brugelette, Belgium. Giant panda Hao Hao gave birth to two cubs on Aug. 8, 2019. This was the 2nd and 3rd birth of giant panda at Pairi Daiza after the birth of Tian Bao, a male, on June 2, 2016, a historic first for Belgium.

Giant panda Tian Bao plays at Pairi Daiza zoo in Brugelette, Belgium, Sept. 25, 2019. Giant panda Hao Hao gave birth to two cubs on Aug. 8, 2019. This was the 2nd and 3rd birth of giant panda at Pairi Daiza after the birth of Tian Bao, a male, on June 2, 2016, a historic first for Belgium.

A breeder takes care of a panda cub at Pairi Daiza zoo in Brugelette, Belgium, Sept. 25, 2019. Giant panda Hao Hao gave birth to two cubs on Aug. 8, 2019. This was the 2nd and 3rd birth of giant panda at Pairi Daiza after the birth of Tian Bao, a male, on June 2, 2016, a historic first for Belgium.

Photo taken on Sept. 25, 2019 shows the twin panda cubs at Pairi Daiza zoo in Brugelette, Belgium. Giant panda Hao Hao gave birth to two cubs on Aug. 8, 2019. This was the 2nd and 3rd birth of giant panda at Pairi Daiza after the birth of Tian Bao, a male, on June 2, 2016, a historic first for Belgium.

Photo taken on Sept. 25, 2019 shows a panda cub at Pairi Daiza zoo in Brugelette, Belgium. Giant panda Hao Hao gave birth to two cubs on Aug. 8, 2019. This was the 2nd and 3rd birth of giant panda at Pairi Daiza after the birth of Tian Bao, a male, on June 2, 2016, a historic first for Belgium.

Photo taken on Sept. 25, 2019 shows the twin panda cubs at Pairi Daiza zoo in Brugelette, Belgium. Giant panda Hao Hao gave birth to two cubs on Aug. 8, 2019. This was the 2nd and 3rd birth of giant panda at Pairi Daiza after the birth of Tian Bao, a male, on June 2, 2016, a historic first for Belgium.