An excellent sillybooks story following a family as they find an egg, decide what to do with it, keep it safe and then have to say a part goodbye as things move on.
SillyBooks -
The Family Egg
SillyBooks.net 
From silly and sensible or sensibly silly ask the Children what sort of egg they might like to find and where that might be? would it be big or small, purple or white and what would be inside ..
For planning - history / time lines, tools and equipment or babies you could look at storage solutions - How the egg could be kept safe and in what, how incubators are used and items preserved. Chat about who you would ask for help... and what would happen if the baby grew too big for the house ..
Enjoy and please add on with any dinosaur egg activities you've had fun with ..