8 month old crying in sleep and rolling

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Updated on Mar 29, 2017
hi my son is 8months old, alwys keeps crying in SLP from past two weeks. even after having his meal he keeps crying, he has very little n very thin too. I think stomach not full but he only moves away from his food. I give food after 5mins he refuses and keeps playing n wen I start with work he starts crying. I don't know wats the matter.. he slps well too.