The only restrictions are on actual liquids and gels. Think materials that could be mixed together to make an explosive. So applesauce and yogurt would be an issue, but not wipes.
The best thing you can do when flying with children is get to the airport early and leave plenty of time to get through security. Not being in a hurry cuts way down on the stress level. I would rather sit at the gate for an hour than be in a rush.
Beth, mom to older DD (8/01) and younger DD (10/06) and always missing Leah (4/22 - 5/1/05)