"Wait mom, let me fix my hat!" Desiree, 32, captioned the photo of her swaddled baby on Sunday.
"We welcomed into the world our baby boy, Zander Cruz Siegfried, yesterday morning 1/12 at 8:30 am. He is every bit as sweet and snuggly as he looks. :) Can't wait to share more but for now baby and I are getting much needed rest as we spend time with family and are both doing great! #happybirthday #zandercruz #babybrother #Godisgood #newborn."
And Chris, 32, wrote alongside the photo, "'No pictures, no pictures. That trip was a little harder than I thought. I mean, I did plan it 9 months ago, but as always I waited to pack until the last minute and it took over five hours to get here. No one told me to pack extra pairs of pants in case it was cold! Where's my Mai Tai!' In all seriousness, everyone is doing well and we could not be more exhausted, I mean excited! #bachelorbabies #SiegfriedPartyFor4."
Zander was born weighing eight pounds and two ounces, Us Weeklyreported.
"Both mother and son are healthy and happy," Desiree's representative told the magazine.
Days before giving birth, Desire opened up about her second pregnancy, as she and Chris are already parents to son Asher, 2.
"Everything is just way more casual now, everything," Desiree admitted.
"So, like, you know, we're not worried about this silly stuff or the little stuff or, like, we barely just got all of the baby room ready and itâ€™s funny. We don't have to stress about the little stuff."
The couple announced in July 2018 they were expecting another baby, and Chris told Us at the time he couldn't wait to see his little boys bond as brothers.