Poop talk

Sarah
My 2 wk 4 day baby boy has been an exceptional pooper; pooping 6-8 times a day but the last few days he's only pooped 2-3 times a day. Is this normal? I am bf supplementing with 2 oz of formula a day, he is in the 30 percentile for weight so I am not sure if that means he's not getting what needs from the breast! Any ideas or advice?