That the first several weeks, babies are blobs who don't do much but demand from you, but at week 10-12 when they offer up that true first smile, you feel like you've been paid back tenfold.
That you will worry about things you never thought you'd worry about and your instincts are usually right, you should listen to/follow them.
That you would love this little person more than anything on earth and while you remember you life before them, this is so much better.
That there is enough room in your heart to love another baby as much, although it can be different, as you love you first.
For me, that even though I knew my husband would be the best father I could have choosen for my children, once they arrived, he would blow me away with just how exceptional a dad he is and how supportive a husband he continues to be.
To teach your child to sleep when it's not tip toe quiet, and in different places to make good use of that pack and play when visiting friends and you're not ready to leave when it's your child's bedtime but they can sleep anywhere.
To not heat up food or water for bottles since at some point you may be in a place where you need to feed your child but you don't have a place to warm their food - they're used to it being room temp.
To hold your baby and watch them when they sleep - it's the sweetest thing.
That I would choose this life over any other.