K.B.
We are having the same problem. My lil man can even make it through the night without an accident now most nights of the week! Pooping is becoming more and more of an issue. At first he was just going in his underwear, and we tried to show him where poop goes, and let him clean up his own mess to an extent and it didn't work! Now, he doesn't like to upset us so he's holding it in. He will even say, "I didn't have an accident today mom, but that's cause I just not poopin today"
It's hard. My son eats a very healthy diet and was going twice a day, so not going for three days is a HUGE problem. Best Wishes!