Haney shared the news on Instagram, along with a photo of the family of three.
"Sundance 'Sunny' Leon came into this world with a bang! It's been a wild and unexpected week in the hospital, but we are all doing great and loving being together!" Haney wrote on Instagram. "So grateful for our amazing doctors and nurses who have taken the best care of us and to our friends and family for all the love, prayers and support! The power of love and positivity is real. Lil Baby Sunny girl is strong, beautiful and an absolute joy! We've gotten a clean bill of health and we're going home tomorrow. Yeehaw! The adventure has begun!!!"
On Friday morning, Midland announced that the band would be postponing their upcoming tour do to a "medical emergency following the birth of Mark and Ty's baby." Thankfully, baby Sunny has made a full recovery. The couple brought their newborn home on Nov. 30.
Earlier this year, Wystrach told People that the baby-on-the-way has made him reevaluate everything.
"Ty and I are going to have a beautiful baby girl in a few months -- in November -- and it is the most exciting thing that has happened in my life," Wystrach told People. "Talk about something that makes you really take a step back and truthfully assess who you are and who you wanna be for this young little one."
The couple announced their engagement in May of 2018 via Instagram. Haney is the founder and CEO of the athletic apparel company Outdoor Voices.
People adds that Wystrach's twin brother, Mike, is expecting a baby around the same time.
"I really do believe in timing," Wystrach told People, explaining that he and his twin "have been through everything in this life together" so "the fact that we are both having baby girls within three weeks of each other, both getting engaged, both getting married, all at the same time -- it's pretty amazing."
"I knew from the first moment I laid eyes on her that I was going to marry her," Wystrach told People.
Midland released their most recent album Let it Roll in 2019.
Now Watch: Brad Paisley and His Wife Kimberly Are Opening a Free Grocery Store For Those in Need
Enjoy all things country?
Don't miss a story! Sign up for daily stories delivered to your inbox.