Kim Kardashian and Kanye West’s baby boy, Saint West, celebrated his 9-month birthday on Monday, Sept. 5. To mark this new milestone in her son’s life, the reality star shared a series of adorable Snapchat videos of Saint giggling while trying on various filters.

In one Snapchat video, Kardashian, 35, put an old man filter on Saint, complete with glasses, a gray mustache and a checkered blue hat. “You're 9 months old today. What an old man you are,“ Kardashian told her second child, whose big sister is North, in the clip. Saint, obviously enjoying himself, then started giggling in delight.

The “Keeping Up With the Kardashians” star used the deer filter on Saint in another Snapchat clip, in which she gushed, “Are you the cutest little deer I ever saw?” She joined Saint in a third video, where both mother and son now wore the deer filter. Check out Kardashian’s videos of Saint below!

Though Kardashian is more open now to sharing photos and videos of her son, this wasn’t always the case. She previously revealed why she didn’t post anything about her son during her pregnancy and the months after she and West welcomed Saint in December 2015. It turns out she was trying to keep her son’s life private, but it came to a point where people thought he didn’t exist at all.

“I wasn't posting about my son because I want him to go to the park like every normal human being. But some people thought I had a full fake baby because I wasn’t posting. … I'm protective of my life with my kids. You might see them on the show a bit, but not real stories,” she told Us Weekly in August.

Meanwhile, Kardashian and West’s 3-year-old daughter North was initially “scared” of Snapchat, but she eventually warmed up to the app and has become the subject of many of her mom’s videos and photos.