Kailyn Lowry's elder sons shared a sweet moment with their newborn brother in a photo this week.

The 25-year-old "Teen Mom 2" star posted pictures of 7-year-old Isaac and 3-year-old Lincoln with Baby Lo on Wednesday after welcoming the infant Aug. 5.

"Nothing compares #motherofboys #momx3," she captioned the snapshots for her 3.1 million Instagram followers.

Lowry shares Isaac with ex-boyfriend Jo Rivera, Lincoln with ex-husband Javi Marroquin and Baby Lo with Chris Lopez. She told Radar Online she and Lopez have yet to give Baby Lo an official name.

"We don't have a baby name at all, and we don't have any ideas either. I feel like everything we thought we liked doesn't fit him," the star explained.

"I wasn't disappointed at all," she said of having another boy. "Boys are all I know, so I think it worked out for the better. And I always said I could never picture myself with anything other than boys."

Lowry discussed the challenge of picking a name on Twitter after posting a first photo of Baby Lo on Instagram earlier Wednesday.

"Isaac said the name Murphy was 'eh, okay... for a dog,' and also suggested Francis," she tweeted. "linc is still adamant about naming baby Lo 'climber.'"

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Lowry said in a since-deleted blog post in April that she will be raising Baby Lo as "a single parent."

She co-stars with Jenelle Evans, Chelsea Houska, Leah Messer and Briana DeJesus on "Teen Mom 2," which airs Mondays on MTV.