Dan's ex-girlfriend gave birth to Teddy last December and the TOWIE star has now described him as "the most incredible human ever".
The hands-on dad, who is on good terms with Teddy's mum, posted a cute photograph on Instagram today (7 August), which was taken shortly after his son's birth.
In the snap, the reality star is cradling the newborn and giving him a kiss. Too cute!
Alongside it, Dan commented: "The best Throwback Thursday ever!! When the most incredible human entered my life."
Little Teddy has certainly changed in the last seven-and-a-half months and he recently reached a big milestone. Yesterday, Dan shared a video of a very happy Teddy crawling along the carpet.
"My boy is growing up too quick!" Dan, who is dating EastEnders' Jacqueline Jossa, commented.
Keep the pictures coming, Dan!