EBF Baby Boy Sleeping More At Night

Our son will be 9 weeks old on Wednesday and is EBF. For the past two nights he has had over 5 hour stretches of sleep, which is great sleep for the both of us, but not great for my breast. He has a cold right now, but has no problem nursing. Before he would sleep 2-3 stretches and wake up to nurse and get a diaper change. He is awake most of the day with one good nap during the afternoon. My daughter (3 years old) woke up a couple of times a night to nurse at his age. I don't know if it's a fluke or a new normal. Any other EBF mother's experiencing this?