Romo shared the news and a picture of Jones Mccoy Romo on Twitter:
Crawford announced in February the couple was expecting their third child during a radio interview on 96.7 FM The Ticket in Dallas.
"We will be expecting our third little Romo offspring this August," she said, via E! Online's Francesca Bacardi.
The couple already has two sons. Hawkins Crawford Romo was born in April 2012 and Rivers Romo followed in March 2014.
Romo announced his retirement from the Cowboys in April. He played his entire 13-year NFL career in Dallas after being signed as an undrafted free agent in 2003.
The 37-year-old Romo will be part of CBS Sports' main NFL broadcasting team as the color analyst with Jim Nantz as the play-by-play man during the 2017 season.