Babies are usually adorable, but these infant squirrel monkeys are absolutely going to steal your heart.

Four of these cute little guys have recently been born at Taronga Zoo in Sydney, Australia, with the youngest born only as recently as Jan. 10 and the eldest was born on Dec. 20.

"It's a very exciting time for the family group of 17 Squirrel Monkeys. We are starting to see the older babies venturing off mum's back and exploring the trees and ropes, and being very playful together," primate keeper Janet Lackey said in a statement.

"The youngest baby is still clinging tightly to mum as there is quite a big developmental difference between four and six weeks of age."

The names and sexes of the babies are yet to be determined, but in the meantime they're receiving plenty of attention from the adults in the group.

“We have noticed some of the aunties in the family group have started sharing the responsibility of looking after the babies. It’s wonderful to see some of our more experienced mums, who haven’t had a baby this season, sharing their mothering skills," Lackey added.

"It's also lovely to see some of the younger aunties practicing their mothering skills and the whole community working together to bring up the babies."

Native to Central and South America, the squirrel monkey isn't endangered, but it is at risk of habitat loss and the illegal pet trade.

Now, just look into their beautiful eyes.

Adorable.

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