My lo is 6 mths now... for the past few days he has been really cranky... been crying alot out of the blues... tried comforting him by carrying him also no use....

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Aside from teething, colic is the other thing which came to my mind. Usually that happens and they get really cranky fussie and irritable

He could be teething or any tummy discomfort? Whole day crying?

It could be teething at this age. Does he show any other symtoms?