So I have been breast-feeding and pumping since day one but as of recent (the last 4-5 days) my nipples feel really tender. It kind of feels like a little man is pulling really hard when he's eating (and he even got frustrated to the point yesterday but I ended up caving and giving him a bottle instead). But when I self express I still have milk - maybe he's trying to eat faster than he can pull out? The cluster feedings have definitely been real this week too. I also upped the size of my breastshield a couple weeks ago to accommodate for more milk production. Any advice, recommendations or insight?