Have any of you mommies exclusively pumped? I'm considering it because I've been told that nipple shields can reduce milk supply but I cannot for the life of me get my baby to latch to me without the shield. Also, for some reason my baby gets extremely upset when at the breast but seems to do fine with a bottle but I would like to use my breast milk still. So, if you have exclusively pumped, I would like all the information you can give me.