"Teen Mom 2" star Kailyn Lowry gave fans a first glimpse of "Baby Lo" this week.
"Baby Lo," she captioned the snapshot for her 3.1 million followers, adding a blue heart emoji.
Lowry has yet to officially name her newest addition. She is already parent to 7-year-old son Isaac with ex-boyfriend Jo Rivera and 3-year-old son Lincoln with ex-husband Javi Marroquin.
"Still trying to pick one," the star tweeted Monday. "I think I'm overthinking it."
Lowry confirmed Baby Lo's birth Saturday after Radar Online reported she welcomed her son at 3 a.m.
She shares her son with Chris Lopez, but said in a since-deleted post in April that she will be raising the child alone.
Lowry came to fame on the MTV series "16 & Pregnant" before starring on "Teen Mom 2." The show airs Mondays, and co-stars Jenelle Evans, Chelsea Houska, Leah Messer and Briana DeJesus.