A three-month-old baby has diarrhea for ten days. How to solve it?

Patient's question:

Okay, here is the translation following your instructions:
Diarrhea for 10 days now, about 6-7 episodes a day. The stool is yellow. Before taking probiotics, there were curds. These days, taking probiotics, no curds, but it's quite watery.
Additionally, the baby has been sniffling at night since before the full moon started. Doesn't sniff during the day. Has nasal discharge. The baby is breastfed.
The baby doesn't seem uncomfortable, doesn't fuss much, and sleeps well.
Past treatment and effectiveness: Took probiotics for three or four days.
Help needed:
1. What could be causing the diarrhea when the baby isn't fussy? Is it related to breastfeeding? (Because the mother started riding a bike to work, gets home feeling cold, and immediately starts breastfeeding – is it related to drinking cold milk?)
2. Does the baby need any medicine for the sniffling at night? Will it affect the nose?

Doctor's answer:

Based on the patient's medical history and age, it is still considered to be caused by indigestion. The child's digestive system has not yet established its normal microbiota, which can lead to such symptoms as dryness, nausea, and vomiting at times. It is recommended to take probiotics such as live bifidobacteria for treatment. Please note not to take it with hot water. The child's symptoms will gradually stabilize. If this does not work, it will be necessary to take the child to the hospital for a thorough examination to identify the cause and provide accurate symptomatic treatment.

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