If I could go back to before I had my first baby, these are the things I would tell myself:
It's okay to make mistakes
Your heart will grow exponentially the second you see your baby
Babies are made out of rubber
There will be long nights and tough days - but they will all be worth it
No one is perfect.
Save yourself the trouble and skip the bassinet. Everyone will sleep better if you cosleep
Cherish the time you spend nursing your babies.
You will love your husband even more once you see him with your kids
You will care so deeply for your children that your body aches
You will be completely humbled, and you will never forget the first time their tiny voice says "I love you, Mommy"