Um, we probably need more information to let you know. Like, how long have they had loose droppings, has there been a change in diet, did you give them anything that promotes loose droppings like a lot of greens, are they exhibiting any other symptoms of distress or disease?
It really just depends. I have 6 week old Royal Palms, and they get loose, green droppings temporarily for about an hour every day after I give them a couple of heads of leaf lettuce or similar greens -- they just go wild for them and I'm pretty sure this is harmless -- they are growing like weeds, that's for sure. So this is the kind of situation where I wouldn't be concerned.
OTOH, if your birds have had loose droppings for several days with no change in diet or anything else I'd become suspicious that something is up, and if they were showing any other symptoms I'd definitely be concerned.
So, please let us know more details so we can collectively try and figure out what is going on.