During breastfeeding I am ganing weight And my chest size increases why ?

A. Actually till the time you feed sometimes the body is making so much of feed and if you have good amount of it then the breast size increases for the time being but comes back to normal size once you quit breastfeeding and if you’re gaining weight that is because you’re eating a lot probably and that is another common thing with breastfeeding mother so you really need to eat in a moderate amount