Wanting to wait a while till

I’m wanting to wait a while until I post a photo of my son after he’s being born and I’m not wanting family members to post any either like especially in the hospital i want my first photo of him to be nice I’m a photographer and I want to take some nice ones when we go home I know how newborns look really funny in the first week and its just going to be hard to get my family not to post photos as they always do how should I go about asking them not to take pics?? Also for privacy reasons I don’t want them posting as I don’t want my ex to see my son