The Tolerance of Organic Formula Milk and Its Fecal Microbiome Characteristic in Infants

This interventional study aims to investigate the tolerance of organic formula milk on infants supplemented with organic formula milk. This study also observes gut microbiota, short chain fatty acids, nutritional status, and atopic manifestation on infants supplemented with organic formula milk. This study will be done on 50 subjects, with an age of 6-7 months old, 38-42 weeks of gestation, had a birth weight ranging from 2700 grams to 4200 grams, not suffering from any major congenital anomaly, not severely stunted at birth, has a normal thyroid function, not suffering any prominent gastrointestinal disease, not having a severe disease at the beginning of study, and has an approval from their parents. Participants' diet will be added an organic formula for infant for 3 months, and will be monitored regularly, since this study starts, at each month, and at the end of this study. The participants' gut microbiomes will be calculated at every session of monitoring by collecting their fecal samples, and brought to laboratory. Anthropological data (weight, height, body mass index), atopic manifestation, IL-6 and IL-10 will also be collected.

All the guardians or parents of the participants in this study will be interviewed in order to record the dietary and sign for inform consent. Parents will be given a journal to record the participant's diet, any sign of colic on subjects, quality of sleep, and wellbeing. All the participants will be fed organic formula milk as a part of their dietary for 12 weeks. Before feeding the formula, the nutritional status will be measured and the participant's fecal will be collected for microbiome and short chain fatty acid (SCFA) examination. Every month the parents will be called in order to assess for child's sickness, allergy, body weight, length, head circumference, and to review their journal.

A visit follow up will be done before and after the study, the tolerance, nutritional status (including body mass index) and fecal collection for all subjects will be performed. The investigators will also collect the allergy related data. Each fecal examination will follow a strict cold chain procedure, each sample will be collected directly, bottled, and frozen to minimize error. The frozen samples will be transported in insulated bags with frozen ice blocks before being transferred to -80°C for storage.

A statistical analysis will be performed using r program and STATA 13.0. The Normality of data distribution will be tested using the Shapiro-Wilk test. To evaluate potential associations between factors in relation to fecal microbiome or SCFAs, Spearman's rank correlations will be calculated. A p-value \<0.05 will be considered significant.

The model will be adjusted for potential confounders. Estimated associations will be described as odds ratios (ORs) with 95% confidence intervals (CIs). The non-parametric Wilcoxon test for paired samples will be used to compare different laboratory parameters at different times of collecting samples. The Mann-Whitney U test for unpaired samples will be applied to compare different categorical parameter between infants before and after treatment. Multivariable linear regressions will be done to find out the association of different parameters change before and after treatment.

Eligibility Criteria:
Inclusion Criteria:

* Healthy infants 6-7 months of age.
* Gestational age 38-42 weeks
* Birth weight \>2700 and \<4200 gram
* Not suffering from a major congenital anomaly, severely stunted at birth, not having a thyroid problem, not suffered from prominent gastrointestinal diseases, severe diseases at the time of inclusion (severe pneumonia, severe dehydration, etc)
* Parents want to follow the study by signing the informed consent

Exclusion Criteria:

* Subjects are in the severe disease condition at the time of recruitment
* Severe acute malnutrition
* Have conditions that will influence the nutritional status such as moderate to severe dehydration, organomegaly, edema.