Sleeping issues

So my son is 28 weeks. From about 2 weeks old he has always been an incredible sleeper. We have a nighttime routine with him and he normally sleeps about 11 hours straight. Recently within this past week, he’s been eating a lot more before bedtime (9+ ounces) and then waking up every 4-5 hours to eat again like he hasn’t ate in days! He is not teething and we just were at the pediatrician and everything was fine with him. I don’t think this is a leap either. Is this happening to anyone else’s baby?