Your baby was always good sleeper. Recently he has been having a problem with sleeping and is unhappy during the day. A sudden change like this meands that something is worrying him. It does not appear to be food related, although he does not seem to be drinking enough. He does not need extra vitamins.He could be teething although you would recognise the signs. He may have some other problem, possibly an ear infection. It would be best just to have him seen by his paediatrician as the change in his nature and sleeping pattern has been quite sudden and dranmatic.
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