Other mothers are so judgmental!

One thing I've noticed since getting pregnant is how judgemental other women are! It's kinda scary, and all tough I'm usually very outgoing and honest with my thoughts and feelings I now prefer to keep quiet. Why do women, as soon as they have kids, start acting like they are better then other women? Judge and preach, almost placing themselves above others. It's really sad. Women should be more supportive towards each other! I just don't understand and it's actually ruining a lot of the pregnancy-experience :(