The 36-year-old gave birth to Tennessee James, her first child with husband Jim Toth, in September and six weeks later the proud mother debuted the baby on a stroll, reported Ace Showbiz.
The actress made no attempt to shield Tennessee from onlookers and was photographed scooping the youngster out of his stroller and parading down the street cradling her bundle of joy.
Witherspoon also has two kids with ex-husband Ryan Phillippe, daughter Ava, 13, and son Deacon, nine.