What temp should i keep a baby budgie at on hatch day?Also when they hatch do they immediately need a feeding?

Need to know what temp the hatched bird needs to be at..right now i have the eggs a little over 70 degrees with a heatbag and blanket in a drawer..also when they hatch can i still close the drawer to keep them warm or do i need to work out a different living arrangement? And i need to know if the bird is hungry right away when hatched.