Who exclusively pumps ?

Pearl

I’m currently breastfeeding my little man and eventually want to be able to give him a bottle every now and then but he’s just started being really fussy dosent want my boob sometimes I’ve got heaps of milk I think it might be too much for him it’s stressing me out and I’m too scared that if I introduce a bottle now he’ll never want my boob, is it hard to exclusively pump? I’m worried it will turn into formula feeding I really want to keep him on breastmilk, what are the pros and cons ?