I am a STM. Both my husband and my self have large families. With my first every single one of my in-laws (7 siblings, their spouses and children, and his parents) + my parents, sister, brother, and 1 brother in law all spent the entire day in the delivery room with me. It was overwhelming and I did eventually kick everyone out except my husband, mom, and sister. 
So this time I wanted to set some rules before anyone even shows up to avoid the extra stress that day. They are: only 4 people at a time in delivery room while laboring, no minors (aside from my daughter), no photography, and no social media updates on my labor and delivery progress. 
Some of this I can just pull the "it's the hospitals policy" line, but others not so much. When I told my sister and dad they both questioned why that would be a policy (no photography during delivery actually is the hospital policy) and didn't seem to take any of it seriously. Except the social media one which they both said there is no way that will happen (as in they refuse to not post)! 
I don't know what to do. Is it too much to tell them if they can't follow the rues and respect my wishes they are not allowed to come in until we are moved to the women's and children's room?                 
                             
        
Re: Rules for visitors in L&D
I feel that giving birth is a very intimate moment that should only include you and SO.
Don't tell them all you are in labor.
Or - tell them they are NOT allowed in the delivery room and you will only accept visitors once you are settled later.
This is really your DH's job to manage and respect your wishes.
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DD 7/2010, DS 3/2012, #3 due 4/24/2015
My sister is quite prone to cold sores and after that newborn baby died from a kiss from someone who had a cold sore I told my sister that if she might be about to get one or has one that's just going away then she can't touch and especially kiss the baby untill its gone because I just won't risk it
This is a private thing between you and baby daddy - don't let anyone push you around! After all, YOU are the one pushing out the baby, not them!