Good morning! It's been four months and one week. I'm worried about my…

Good morning! It's been four months and one week. I'm worried about my baby's loose stools, we went once a day yesterday. But today it's four times. The stool is watery, yellowish, with a slight smell. There's no fever, saliva has been flowing for three months now. Should I be concerned and go see a doctor? Are the teeth growing in? Please tell me what needs to be done? Won't there be dehydration? I'm very worried!