Gorilla Sindy rest her head on her hand as she protects her newborn baby at the Artis Zoo in Amsterdam, Netherlands, Friday Jan. 22, 2016. The baby was born Thursday after an eight-and-half month pregnancy, Sindy's fifth pregnancy, the first two babies died, her other two sons are still in the capital's zoo. The baby has no name yet as the gender is not yet determined. (AP Photo/Peter Dejong)

Amsterdam zoo Artis is celebrating a new arrival after its western lowland gorilla Sindy gave birth to a healthy baby.

Mother and newborn were both doing well Friday, with Sindy protectively cradling her baby as it was drinking her milk. The new arrival adds to the zoo's gorilla group, which is made up of a silverback male, three and five .

Zoo spokeswoman Diane Borst says the baby's gender has not been established since its birth Thursday.

The delivery was also good news for the western lowland gorilla species, which is endangered primarily due to hunting and loss of habitat in its African homelands.

  • Gorilla Sindy feeds her newborn baby at the Artis Zoo in Amsterdam, Netherlands, Friday Jan. 22, 2016. The baby was born Thursday after an eight-and-half month pregnancy, Sindy's fifth pregnancy, the first two babies died, her other two sons are still in the capital's zoo. The baby has no name yet as the gender is not yet determined. (AP Photo/Peter Dejong)

  • Gorilla Sindy feeds her newborn baby at the Artis Zoo in Amsterdam, Netherlands, Friday Jan. 22, 2016. The baby was born Thursday after an eight-and-half month pregnancy, Sindy's fifth pregnancy, the first two babies died, her other two sons are still in the capital's zoo. The baby has no name yet as the gender is not yet determined. (AP Photo/Peter Dejong)

  • Gorilla Sindy feeds her newborn baby at the Artis Zoo in Amsterdam, Netherlands, Friday Jan. 22, 2016. The baby was born Thursday after an eight-and-half month pregnancy, Sindy's fifth pregnancy, the first two babies died, her other two sons are still in the capital's zoo. The baby has no name yet as the gender is not yet determined. (AP Photo/Peter Dejong)

  • Gorilla Sindy feeds her newborn baby at the Artis Zoo in Amsterdam, Netherlands, Friday Jan. 22, 2016. The baby was born Thursday after an eight-and-half month pregnancy, Sindy's fifth pregnancy, the first two babies died, her other two sons are still in the capital's zoo. The baby has no name yet as the gender is not yet determined. (AP Photo/Peter Dejong)

  • Gorilla Sindy feeds her newborn baby at the Artis Zoo in Amsterdam, Netherlands, Friday Jan. 22, 2016. The baby was born Thursday after an eight-and-half month pregnancy, Sindy's fifth pregnancy, the first two babies died, her other two sons are still in the capital's zoo. The baby has no name yet as the gender could not yet be determined. (AP Photo/Peter Dejong)