constipated

I have a newborn conure chick, it’s been nearly a whole day since it was born and it hasn’t pooed at all. I’ve fed it, it’s been hours and its crop still looks full to me… Help?!

My almost 2-year old budgie is constipated. Is it alright if I give him a few drops of Vegetable Oil to help him?

My albino budgie is acting weird and I am worried. She hasn't acted like this before. She is puffed up and seems to be squealing to force something out. She is still preening from time to time. Not talking much either. She seems alert though. Has her head down most of the time. Seven years old...