Fox posted a picture on Instagram of her lying next to an infant Wednesday. The 30-year-old actress gave birth to Journey River in August. He's her third son with husband and former "Beverly Hills, 90210" star Brian Austin Green.
The couple also has 4 and 2-year-old boys.
Fox filed for divorce from Green in Aug. 2015. The couple hasn't publicly said whether they planned to follow through with the breakup.