This is an excellent question and you certainly have made your concerns very clear.If your baby had only recently strtaed with his sleep problem then the most likely reason would be teeething. However he has always woken up repeatedly. You do not mention how you are feeding him.Does he perhaps have a blocked nose? If he does you should help him to clear his nose by using infant saline nose drops.He may simply be hungry especially now when he needs solids as well as his milk.He does not appear to have any milk or lactose intolerance.Before you can think about sleep training your baby you need to be sure that he is not hungry and does not have any discomfort from teething.
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