Inclusion Criteria:  Parental informed consent, ASD and ADHD will meet the DSM diagnoses (edition IV-TR or 5) criteria Ages between 4 and 14 years To complete period (12weeks) of taking the probiotic  Exclusion Criteria:  Having suffered adverse effects in the previous administration of probiotics, To suffer any medical illness incompatible with the administration of probiotics Having intolerances or allergies to the excipient of the treatment (probiotic or placebo) Taking antibiotics in the start of the intervention.