Something I learned was how much a babies smile could really mean to you. You could be having the worst day of your life but when your baby looks at you and smiles nothing else matters anymore.
Always keep a barf bag or bucket and a roll of paper towels in your car after having kids. They're as essential as a change of clothes and all other diaper bag contents. Don't ever underestimate the phrase, "My tummy hurts."
I know this is so cliche' but ive learned that Love actually does have no limits when it comes to your children! I love my son Cole more and more each day and nothing he does could make me love him any less!