my 5 month old ds has had a cold for the past few days and has not been eating as much in the way of solids or bf'ing. Usually he would lunge at the spoon when I have been feeding him. He does have a stuffy nose. Could he be not eating as much because of his cold? Also when using the spoon after the food is in his mouth he seems to want to suck on his upper lip? What is with that?