The past 2 nights, our DS has been spitting up more and vomiting after meals even after burping and sometimes even after minutes of keeping him in an upright position. he also normally wakes up every 2-3 hours to feed but didn't for the past 2 nights. he normally eats around 4oz every 2-3 hours but now he only eats around 2oz. I had to wake him up at 4am because it was already past 4 hrs that he hasn't eaten. he basically slept through the night but this morning he is still super sleepy and would sleep a few seconds after sucking. we have a schedule at the clinic but it is later in the afternoon and would like to know if anyone experienced the same and what happened to ease my worry and to possibly gather more questions for the doctor later. our DS is 5 weeks old now he was born 4 weeks early. we just had his last checkup last week and he is gaining weight and getting longer.