Check out Gripe Water on Amazon.
This gripe water is so helpful. My daughter, daughter in law and nieces all have used this product. I have used this as well when watching my grandchildren. When you know your baby has been changed and fed and still is upset. Pretty much it is gas or air bubbles. This product is a natural way of helping your newborn to feel better. Plus when your newborn isn't upset then Mom isn't upset. Every mom has a hard time with babies when they are crying. I can tell you that we have also used a generic product of this at Walmart and it works just as well. You do need to be careful though when opening it. Please read the instructions and throw away when you are suppose to. When used right this stuff is amazing. Happy infant makes a happy mom.