“Me and my little buddy shopping for baby stuff at #buybuybaby #babies #family,” the Backstreet Boys star, 36, captioned the image.
Last month, the proud papa posted a photo with his baby boy watching football.
And in August, the Larger Than Life hitmaker shared a shot with his tot.
“Trying to get back into #boyband shape with my little buddy for our next #backstreetboys album and tour. Pushing a stroller is crazy cardio lol. #babies #baby #fitness,” Carter captioned the image with his son in the stroller.
Recently, the singer shared a shot with his son in the studio.
“Hanging with daddy for the first time at the studio while we record a song for the new @backstreetboys album. #babies #newmusic #backstreetboys,” Carter captioned the image cuddling his newborn.
The Everybody singer and wife Lauren Kitt Carter welcomed their first child on April 19.