My DS is almost four weeks old and I decided to try and introduce a bottle this week. I pumped for the first time on one breast this morning for 15 minutes resulting in nearly 3 oz of milk, over the next several hours the same breast became severely and painfully engorged. What did I do wrong? How do I get rid of the engorgement? How can I pump without becoming engorged? I still want to be able to pump once in awhile.