I'm concerned of my baby has mucus in her poo. All of her poos look like this and I'm not sure if that is just what it's supposed to look like or if it's mucus as there is a bit of stringiness you can see in the picture. She is an exclusively breastfed baby and doesn't show any signs of being uncomfortable or in distress, no vomiting or diarrhoea or blood in stool. She is teething but her poo was like this since she was 3.5months old.