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Hello and thank you for you question.
If your son is otherwise happy and interactive, has no fever, cold symptoms, or vomiting/diarrhea, his decrease in feedings are probably due to a change in his stool patterns. Sometimes babies feed a bit less when they are feeling "full" faster than normal. This sensation can be due to gas or excess stool in the intestines. Is he passing less stools or are they more formed instead of liquid?
If this is the case, he may end up developing hard, constipation-like stools, leading to more irritability and feeding difficulties.
I would suggest feeding him more frequently, but still allowing him to take the smaller amounts at his feedings. This will increase his milk intake, allow him to pass stool better and still enable him to gain weight properly.
If more frequent feedings does not help, he should see his pediatrician to make sure he is not losing weight.
Ok. No problem.
Normal stools are a reassuring sign. How often does he breast or bottle feed?
Since he seems to take less during his feedings, I would recommend offering every 2-3 hours.
If things don't improve or he feeds even less over the next 3-5 days, I do think he should be seen by his pediatrician.
I'm not sure if you are still in chat. I am here if you still have questions.
Thank you for clarifying. It sounds like he has greatly decreased his feeding and may even feel discomfort while feeding. Does he pull away from the breast or bottle, cry and arch his back during feedings? If so, he could be having painful acid reflux, what we docs call GERD. In such cases, a liquid version of Zantac (ranitidine) can be prescribed which reduces the discomfort. Normal feeding usually resumes after a few days of the medication.
You are very welcome! Best wishes to you and your baby!