Bonobo

Bonobos reproduce year-round but take a four-year break between pregnancies.

An excerpt from the article 18 facts about bonobo

They reach sexual maturity between the ages of 8 and 9, but females give birth for the first time at 13 or 14. Pregnancy lasts an average of 240 days, after which one young is usually born. The female feeds them with milk until they are about 5 years old.