Do not give injections. Observe if he is sick; symptoms of illness include: diarrhea, constipation, bloody stool, hair loss, skin rash, peeling, itching, coughing, sneezing, tail biting, jaundice, arching back, loss of sensation in both hind limbs, drooling, rubbing buttocks, limping, excessive drinking and urination, no urination, loss of appetite, panting, abdominal bloating, weight loss, and obesity. These are common clinical abnormalities in dogs and cats. As a pet owner, you should understand this knowledge and seek timely treatment if abnormalities occur.
Since there is a baby, do not give him random medicine. It is best to take him to the pet hospital to check his diarrhea.