A randomized, controlled study including infants with non-cyanosis congenital heart disease (CHD) in need of surgical correction involving cardiopulmonary bypass (CPB) was established. Infants aged 1 month to 1 years were enrolled between June 2021 and July 2022. The patients in treatment group were supplied with probiotics consisting of Bifidobacterium infantis and Lactobacillus perioperatively and patients in control group were provided with placebo. Data concerning patients' clinical outcome such as diarrhea were collected. Blood samples were collected for measurement of fatty acid binding protein 2 (FABP2), diamine oxidase (DAO), d-lactic acid (D-LA) and C-reactive protein (CRP). Stool samples were collected to investigate the changes of intestinal flora.

Inclusion Criteria:

• a diagnosis of CHD requiring surgical repair with the use of CPB
• age greater than 37 weeks corrected gestational age and less than 1 year old

Exclusion Criteria:

• Patients with inherited metabolic disease, history of intestinal surgery, preexisting gastrointestinal pathology (such as NEC, IBS, inflammatory bowel disease, chronic intestinal obstruction or diarrhea), immunity dysfunction or received antibiotics, probiotics or hormone-replacement therapy within 2 months before enrollment were excluded from the study

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