By peoplestaff225
December 22, 2008 03:00 PM

Stretch! Gwen Stefani pops her sleeping 4-month-old son Zuma Nesta Rock out of his sling while returning from a walk in the park in Ventura, Calif. on Sunday.

Joining the No Doubt frontwoman, 39, and her baby boy were husband Gavin Rossdale and older son Kingston James McGregor, 2 ½.

For more of this rockin’ family, take a peek at our Family Album: The Stefani-Rossdales!

See another photo below!