She is 18 days old and the last few days she's only having a poo once a day and really struggles to get it out, when it does come out it's runny and bright yellow and stinks, it smells quite acidic.
I'm combi feeding, mainly formula, she has a bottle a day of breast milk usually.
Does this poo sound normal? I'm just worried as it's become runny, not seedy or grainy anymore but quite smooth. Don't know if it's diarreah? And she doesn't seem to be going often enough