Two Methods of Analgesia for Chinese Term Infants Receiving Heel Lance

1. The purpose of this study is to research and compare two sucking modes' effect(breast-feeding and non-nutritive sucking) and difference,hypothesis is that these two kinds of methods can decrease pain for Chinese term infants receiving heel stick. 2. A convenient sample of 90 neonates from a hospital in Beijing undergoing heel stick for Newborn Screening Program Blood Test were enrolled. They were randomized into three groups: * breast-feeding group * non-nutritive sucking group * control group 3. The results showed that: * Breast-feeding can reduce crying and grimace time, increase oxygen saturation. * Non-nutritive sucking can delay grimace's starting time, increase oxygen saturation.