【Object ive】To study the influence of breast-fed on the incidence of hypoglycemia in new borns . 【Methods】Blood g lucose w ere measured in 306 breast-fed new borns at 1

4

8

12

24

48

72 hours af ter birth . 【Result s】The incidence of hypoglycemia in the new borns w hose mothers w ere complicated by diabetes o r impaired g lucose tolerance

in macro-new borns (birth w eight ≥4 000 g)and in low er bi rth w eight infants (bi rth w eight <2 500 g)were 22.4 %(11/49)

36.9 %(31/84)and 29.6 % (8/27)

respectively

and were higher than that in normal new borns (11.6 %

17/146).【Conclusion】In breast-fed newbo rns

monitoring of blood g lucose should be given to those w hose mothers were complicated by diabetes o r impai red glucose tolerance

to macro-new borns and lower bi rth weig ht infants .