Has anyone been through this?

Janeth

My 3 week old was use to drinking 3.5 oz each feeding and now he bearly drinks 2 oz (it started yesterday morning) and slept most of the day yesterday when he was active and curious at least once a day... is this normal?... also he started coughing a little from time to time (we are taking him to the pediatrician today for that) just wondering if anyone had something similar happen to their baby