WWWHHHYYYYYYYYYYYYYYY?

0k, really- the thing is I am pretty tired of being a diaper changer/mess cleaner. Somehow, I don't think my boys are ready to hear that though.
When should I broach the subject?

Yesterday at the mere idea of dirty diapers and needing to see 0 of them, the baby pooped. The poop was so bad that...when I removed him from his booster seat in the kitchen it began to ooze out of his shorts and down his leg and hubby had to remove the seat and hose it down in the yard. Gross!
I ran into the bedroom with baby held as far away from me and my arms reach could go, I even though about stretching first, but it didn't help. After I removed his offensive clothing and diapers it was everywhere.

I put him in the shower and began cleaning the clothing when what did I notice...my shirt was dirty too! Ahh,eww and yuck! Hubby comes in to check on gross baby and says: "You have crap on your arm."
I leave the children and dart after him scaring him with my poop covered torso.

So, after all is said and cleaned how do I let this family know I'm tired of dealing with the poo and that we all need to move on? I mean the baby is 15 months old already- come on have some decency. He's practically an adult, really.