Baby gut problems?

Al

Hi, I am a FTM and my little boy is EBF. He is almost 4 months now, and since around 6 weeks he went from an av. of 3 poops a day to 1 poop every 6-8 days. So it's been roughly 10 weeks now and very few poops...is this a problem or should I just wait it out? How long can it last?