Objective To investigate clinical features in infants of breast milk allergy(BMA), and the possible relationship with the changes of somatostatin (SST) and motilin (MTL) in breast milk. Methods Twenty three cases of pure breast feeding infants with allergic gastroenteritis were collected, while another 23 normal infants with pure breast feeding were enrolled as normal controls. Samples of infant stools and breast milk were collected for the measurement of SST and MTL levels detected by by radioimmunity. Results The levels of SST and MTL in stool samples (pg/mg) were 32.6±8.9, 2.3±3.7 in BMA group and 56.2±12.7, 21.6±4.7 in normal control group, respectively. Those in breast milk (pg/mg) were 236.7±28.9, 159.4±36.7 in BMA group and 412.6±36.7, 216.8±59.7 in normal control group, respectively. All the differences were statistically significant ( P<0.05). In BMA infants, the clinical features were 91.3% (20/23) of diarrhea, 86.9% (21/23) of vomiting, 69.6% (16/23) of hematochezia, 95.7% (22/23) of C-reactive protein （CRP） increasing, 87.0% (20/23) of occult blood in stools, 73.9% (17/23) of neutrophil increasing, 39.1% (9/23) of WBC in stools. Conclusion For those infants of breast feeding with persisting and repeated gastrointestinal symptoms, allergy for breast milk should be considered. Deficiency of SST and MTL in breast milk may be a possible cause for food allergy.
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