For a 6-month-old, Procillus (Bacillus clausii) should only be administered under a doctor's guidance, who will determine the correct dose. The oral suspension is typically given directly into the baby's mouth or mixed with breast milk or formula using a dropper or syringe, ideally after feeding to aid digestion. It must always be stored safely and carefully monitored for any unusual reactions; it should never be given without a paediatrician's advice.