"Hey ladies, we have such a situation, we're on GVB, 4 days without…

"Hey ladies, we have such a situation, we're on GVB, 4 days without pooping. The tummy is soft. The baby is not fussy. Only when she poops does it smell like milk. We haven't had problems with stool before. I read that this is allowed for babies. But somehow it doesn't feel right. Maybe something can help her? Should we use a diaper or something else? Share your knowledge. Thanks in advance for the answers ??"