I wonder if you do actually have 'ideas' or 'memories' when you are born.
Maybe you do, it's just that you don't know how to interpret them because:
A) You don't understand a language yet
B) When you finally do understand a language, it's not the same language that the ideas or memories that you were born with were encoded in (even if they were both English ;)
It's an interesting thought.
I mean, your brain is there already, so, what's in it..?