My 18 week old usually poops once every other day, but this week he's been pooping 4 times per day. The babysitter didn't say they seemed different, just more frequent, and my SO and I haven't noticed a difference in texture, color, or smell. Baby seems fine, he's been acting normal. He's exclusively formula fed with no change in his formula. Anybody else experience this? Is it something we should worry about? His next appointment is 2 weeks away.