Irritated by laziness

Just realized maybe it'd be easier to read if I were to use caps where I should....anyway....I don't understand sometimes why people get jobs if they're not going to actually DO them. I work at a daycare, and maybe some of you don't realize how hard my job can be so let me tell you. I work in an infant room, with babies ranging in age from 6 weeks (yes, weeks) old to around a year old. My day is literally nonstop from the moment I walk in the door. First I cut teacher breaks in a toddler room. I get there at eleven, just in time to feed the little munchkins lunch, then they go down for a nap. When I go over to the baby room at one, I am instantly checking our dry erase board to see if anyone needs anything like a feeding, diaper change, nap, anything. I am up and down making bottles, feeding jar food, changing diapers, cleaning up after babies all day long. And then when they leave I have to clean my room. I leave at seven and am totally exhausted when I get home. So anyway, the girls I work with in my room have worked in there for quite some time. They know what their job description is. They even know that I get pissed when they don't do their job. Okay, no I'm not their boss. But I do have to clean up their messes after they leave, I have to explain to parents why my coworkers did what they did when it goes against their child's schedule. All I ask for is that they pull their weight. Why is that so difficult?? I know we don't make much money. That's a given. Daycare teachers don't make a lot, but they do a lot. We are with these children more hours in a week than their own parents are, considering most of the time they're with them their kids are asleep. But come on!! Just do your freakin job for cryin out loud!! Grrrrr.....