Soft firm poop to loose poop

My 9 month old baby always having a soft firm poop after solids but now for past 10 days she is having loose stools and innoticed that started after her 6 in 1 and pneumonia 2 vaccinations….and i went to kkh and they prescribed me some probiotics and it was ok after 3 days but still the poop was loose but now having watery stool is this normal?….has anyone noticed this before?