Oct. 2 (UPI) -- Kailyn Lowry is finally sharing her newborn son's name with fans.
The 25-year-old Teen Mom 2 star officially introduced son Lux Russell in an Instagram post Sunday, nearly two months after welcoming the infant with Chris Lopez.
"Lux Russell, 08/05/17," she captioned a slideshow of photos of her baby boy. "7 lbs 15 oz, 19 3/4" born at 3 am on the dot. It only took us 7 weeks to decide a name and 8 weeks to make it official."
Lowry had referred to her son as "Baby Lo" as she and Lopez decided on a name. She said in an interview with Us Weekly last week that she was trying out different monikers.
"I thought I had a name and I would refer to the baby as that name in text messages or say it," the star told the magazine. "And it didn't feel right so I kept trying a couple different ones and none of them felt right."
"I kind of have the one that I want to name him," she added. "But I haven't legally named him yet."
Lowry is also parent to 7-year-old son Isaac with ex-boyfriend Jo Rivera and 3-year-old son Lincoln with ex-husband Javi Marroquin. She posted a picture with her three sons while attending a fall festival Saturday at Fifer Orchards in Wyoming, Del.
"Getting a nice family pic with 3 kids isn't always as easy as one may think," the star confessed in the caption. "Baby Lo is 8 weeks old today & he got to experience his first fall festival."