So let me preface by saying I had a supply issue with my first and he didnt gain weight so I'm always paranoid with my second

So my second baby was nursing 15 ish min on each side about every 3 hours and seemed to empty each breast except for the morning feed when I was very full.

He is 3mo now and the last 3 days he has only been nursing about 10 or 15 min total if I'm lucky and acting full. Usually only 1 side and going usually 4 hours between feeds. I still feel full after he eats as well. My supply doesnt seem to have drastically increased either. He is having good wet and dirty diapers but it's just odd. Any insight?