My 4 month old has just started having quite runny poo's over the last couple days, he sometimes does have this and then it goes back to normal but now his poo has a unusual smell to it, it just doesn't smell exactly like his normal poos. And he's been crying so much today, so restless and only happy when me or dad are holding him. Any ideas please? Bit of a nightmare it's Easter weekend so can't ring the doctors obviously