Four-month-old babies usually need to take Mommy’s Love (i.e. Bacillus subtilis diphtheriae) and Montelukast at the same time 1 to 2 hours apart. Bacillus subtilis bifidus is bacillus subtilis, enterococcus faecium composed of intestinal probiotic preparations, mainly used for the treatment of indigestion, intestinal flora disorders, constipation and other digestive disorders, in the mixing of the temperature of the water should not be too high, and can not be taken orally at the same time with antibiotics, bismuth tannins and so on, four-month-olds at the same time eating bacillus subtilis bifidus and montelukast generally need to be spaced out for 1 to 2 hours. Montelukast is a gastrointestinal mucosal protective agent, with adsorption of intestinal water, toxins, if and bacillus subtilis bifidus and other drugs at the same time orally, the bacillus subtilis bifidus and other drug ingredients adsorbed on the surface of the montelukast, thus affecting the therapeutic effect of the drug. Therefore, when the baby needs to take oral bacillus subtilis and montelukast at the same time to treat the disease, you need to take the baby to the pediatrics department of the hospital, under the guidance of a professional physician to standardize the use of medication.