Is my baby doing okay ?

My 3 months baby is on breastfeed only and she is doing well. I feed her ever 2 to three hours depending on her sleeps throughout the day. From yesterday i have noticed she doesn’t feel hungry and doesn’t want to have milk i mean she looks full even id she wakes up after three hour nap. But also she is not fussy or crying or irritable. She is happy and playful only that she is not having milk that frequently. Which make me worry and also she is popping more from yesterday. Why is that has any one experience the same?