Vernix

So my sister in laws keep saying that if I don’t walk the baby is going to come out with all that “nasty white stuff.” I have looked up the benefits and the reason why babies even have it in the first place. There is literally nothing saying walking or being active has anything to do with how much vernix comes out on the baby. So are they just stupid or is what they are saying true? Because I’ve heard them talk crap about other babies in our family that were born with it and they didn’t want to hold them for that reason.