you shit in the bathtub and seek attention on social networks
what if every girl practiced with dildos of increasing size until she could fit one the width of a baby's head in her vagina?
wouldn't having a kid then be easy as fuck? why don't they all do this?
No matter how much vagina stretching you do, you can't increase the opening of the cervix.
And if you did, it would actually be really dangerous/unhealthy, for the woman as well as a baby.